diff --git a/app/api/entities/unit_entity.rb b/app/api/entities/unit_entity.rb
index f1865d015..9e08ee2f8 100644
--- a/app/api/entities/unit_entity.rb
+++ b/app/api/entities/unit_entity.rb
@@ -45,7 +45,7 @@ def is_admin_staff?(my_role)
     expose :enable_sync_timetable, unless: :summary_only, if: lambda { |unit, options| is_staff?(options[:my_role]) }
     expose :draft_task_definition_id, unless: :summary_only, if: lambda { |unit, options| is_staff?(options[:my_role]) }
     expose :allow_student_extension_requests, unless: :summary_only
-    expose :extension_weeks_on_resubmit_request, unless: :summary_only, if: lambda { |unit, options| is_staff?(options[:my_role]) }
+    expose :extension_days_on_resubmit_request, unless: :summary_only, if: lambda { |unit, options| is_staff?(options[:my_role]) }
     expose :allow_student_change_tutorial, unless: :summary_only
 
     expose :learning_outcomes, using: LearningOutcomeEntity, as: :ilos, unless: :summary_only
diff --git a/app/api/extension_comments_api.rb b/app/api/extension_comments_api.rb
index 3bde9171d..6afcd02f6 100644
--- a/app/api/extension_comments_api.rb
+++ b/app/api/extension_comments_api.rb
@@ -7,7 +7,7 @@ class ExtensionCommentsApi < Grape::API
   desc 'Request an extension for a task'
   params do
     requires :comment, type: String, desc: 'The details of the request'
-    requires :weeks_requested, type: Integer, desc: 'The details of the request'
+    requires :days_requested, type: Integer, desc: 'The details of the request'
   end
   post '/projects/:project_id/task_def_id/:task_definition_id/request_extension' do
     project = Project.find(params[:project_id])
@@ -19,11 +19,11 @@ class ExtensionCommentsApi < Grape::API
       error!({ error: 'Not authorised to request an extension for this task' }, 403)
     end
 
-    error!({ error: 'Extension weeks can not be 0.' }, 403) if params[:weeks_requested] == 0
+    error!({ error: 'Extension days can not be 0.' }, 403) if params[:days_requested] == 0
 
-    max_duration = task.weeks_can_extend
-    duration = params[:weeks_requested]
-    duration = max_duration unless params[:weeks_requested] <= max_duration
+    max_duration = task.days_can_extend
+    duration = params[:days_requested]
+    duration = max_duration unless params[:days_requested] <= max_duration
 
     error!({ error: 'Extensions cannot be granted beyond task deadline.' }, 403) if duration <= 0
 
diff --git a/app/api/units_api.rb b/app/api/units_api.rb
index 4dbc09cd1..376179218 100644
--- a/app/api/units_api.rb
+++ b/app/api/units_api.rb
@@ -84,7 +84,7 @@ class UnitsApi < Grape::API
       optional :portfolio_auto_generation_date, type: Date, desc: 'Indicates a date where student portfolio will automatically compile'
       optional :allow_student_extension_requests, type: Boolean, desc: 'Can turn on/off student extension requests'
       optional :allow_student_change_tutorial, type: Boolean, desc: 'Can turn on/off student ability to change tutorials'
-      optional :extension_weeks_on_resubmit_request, type: Integer, desc: 'Determines the number of weeks extension on a resubmit request'
+      optional :extension_days_on_resubmit_request, type: Integer, desc: 'Determines the number of days extension on a resubmit request'
       optional :overseer_image_id, type: Integer, desc: 'The id of the docker image used with '
       optional :assessment_enabled, type: Boolean
 
@@ -114,7 +114,7 @@ class UnitsApi < Grape::API
                                                           :draft_task_definition_id,
                                                           :portfolio_auto_generation_date,
                                                           :allow_student_extension_requests,
-                                                          :extension_weeks_on_resubmit_request,
+                                                          :extension_days_on_resubmit_request,
                                                           :allow_student_change_tutorial,
                                                           :overseer_image_id,
                                                           :assessment_enabled)
@@ -157,7 +157,7 @@ class UnitsApi < Grape::API
       optional :enable_sync_timetable, type: Boolean, desc: 'Sync to timetable automatically if supported by deployment', default: true
       optional :enable_sync_enrolments, type: Boolean, desc: 'Sync student enrolments automatically if supported by deployment', default: true
       optional :allow_student_extension_requests, type: Boolean, desc: 'Can turn on/off student extension requests', default: true
-      optional :extension_weeks_on_resubmit_request, type: Integer, desc: 'Determines the number of weeks extension on a resubmit request', default: 1
+      optional :extension_days_on_resubmit_request, type: Integer, desc: 'Determines the number of weeks extension on a resubmit request', default: 1
       optional :portfolio_auto_generation_date, type: Date, desc: 'Indicates a date where student portfolio will automatically compile'
       optional :allow_student_change_tutorial, type: Boolean, desc: 'Can turn on/off student ability to change tutorials', default: true
 
@@ -185,7 +185,7 @@ class UnitsApi < Grape::API
                                                     :enable_sync_timetable,
                                                     :enable_sync_enrolments,
                                                     :allow_student_extension_requests,
-                                                    :extension_weeks_on_resubmit_request,
+                                                    :extension_days_on_resubmit_request,
                                                     :portfolio_auto_generation_date,
                                                     :allow_student_change_tutorial,
                                                   )
diff --git a/app/models/comments/extension_comment.rb b/app/models/comments/extension_comment.rb
index abd9d1030..d611d9613 100644
--- a/app/models/comments/extension_comment.rb
+++ b/app/models/comments/extension_comment.rb
@@ -6,7 +6,7 @@ def serialize(user)
     json[:granted] = extension_granted
     json[:assessed] = date_extension_assessed.present?
     json[:date_assessed] = date_extension_assessed
-    json[:weeks_requested] = extension_weeks
+    json[:days_requested] = extension_days
     json[:extension_response] = extension_response
     json[:task_status] = task.status
     json
@@ -38,7 +38,7 @@ def assess_extension(user, granted, automatic = false)
     self.extension_granted = granted && self.task.can_apply_for_extension?
 
     if self.extension_granted
-      self.task.grant_extension(user, extension_weeks)
+      self.task.grant_extension(user, extension_days)
       if automatic
         self.extension_response = "Time extended to #{self.task.due_date.strftime('%a %b %e')}"
       else
diff --git a/app/models/task.rb b/app/models/task.rb
index b1759a1ed..14077ab25 100644
--- a/app/models/task.rb
+++ b/app/models/task.rb
@@ -219,9 +219,9 @@ def processing_pdf?
     end
   end
 
-  # Get the raw extension date - with extensions representing weeks
+  # Get the raw extension date - with extensions representing days
   def raw_extension_date
-    target_date + extensions.weeks
+    target_date + extensions.days
   end
 
   # Get the adjusted extension date, which ensures it is never past the due date
@@ -243,14 +243,14 @@ def tutor
   end
 
   # Applying for an extension will create an extension comment
-  def apply_for_extension(user, text, weeks)
+  def apply_for_extension(user, text, days)
     extension = ExtensionComment.create
     extension.task = self
-    extension.extension_weeks = weeks
+    extension.extension_days = days
     extension.user = user
     extension.content_type = :extension
     extension.comment = text
-    if weeks <= weeks_can_extend
+    if days <= days_can_extend
       extension.recipient = tutor
     else
       extension.recipient = unit.main_convenor_user
@@ -258,7 +258,7 @@ def apply_for_extension(user, text, weeks)
     extension.save!
 
     # Check and apply either auto extensions, or those requested by staff
-    if (unit.auto_apply_extension_before_deadline && weeks <= weeks_can_extend) || role_for(user) == :tutor
+    if (unit.auto_apply_extension_before_deadline && days <= days_can_extend) || role_for(user) == :tutor
       if role_for(user) == :tutor
         extension.assess_extension user, true, true
       else
@@ -269,20 +269,19 @@ def apply_for_extension(user, text, weeks)
     extension
   end
 
-  def weeks_can_extend
+  def days_can_extend
     deadline = task_definition.due_date.to_date
     current_due = raw_extension_date.to_date
 
     diff = deadline - current_due
-    (diff.to_f / 7).ceil
   end
 
   # Add an extension to the task
-  def grant_extension(by_user, weeks)
-    weeks_to_extend = [weeks, weeks_can_extend].min
-    return false unless weeks_to_extend > 0
+  def grant_extension(by_user, days)
+    days_to_extend = [days, days_can_extend].min
+    return false unless days_to_extend > 0
 
-    if update(extensions: self.extensions + weeks_to_extend)
+    if update(extensions: self.extensions + days_to_extend)
       # Was the task previously assessed as time exceeded? ... with the extension should this change?
       if self.task_status == TaskStatus.time_exceeded && submitted_before_due?
         update(task_status: TaskStatus.ready_for_feedback)
@@ -530,11 +529,11 @@ def assess(task_status, assessor, assess_date = Time.zone.now)
     else
       self.completion_date = nil
 
-      # Grant an extension on fix if due date is within 1 week
+      # Grant an extension on fix if due date is within 7 days
       case task_status
       when TaskStatus.fix_and_resubmit, TaskStatus.discuss, TaskStatus.demonstrate
-        if to_same_day_anywhere_on_earth(due_date) < Time.zone.now + 7.days && can_apply_for_extension? && unit.extension_weeks_on_resubmit_request > 0
-          grant_extension(assessor, unit.extension_weeks_on_resubmit_request)
+        if to_same_day_anywhere_on_earth(due_date) < Time.zone.now + 7.days && can_apply_for_extension? && unit.extension_days_on_resubmit_request > 0
+          grant_extension(assessor, unit.extension_days_on_resubmit_request)
         end
       end
     end
diff --git a/app/models/unit.rb b/app/models/unit.rb
index 6e709baab..1582d2810 100644
--- a/app/models/unit.rb
+++ b/app/models/unit.rb
@@ -147,7 +147,7 @@ def role_for(user)
   validates :end_date, presence: true
 
   validates :code, uniqueness: { scope: :teaching_period, message: "%{value} already exists in this teaching period" }, if: :has_teaching_period?
-  validates :extension_weeks_on_resubmit_request, :numericality => { :greater_than_or_equal_to => 0 }
+  validates :extension_days_on_resubmit_request, :numericality => { :greater_than_or_equal_to => 0 }
 
   validate :validate_end_date_after_start_date
   validate :ensure_teaching_period_dates_match, if: :has_teaching_period?
diff --git a/test/api/comments/extension_test.rb b/test/api/comments/extension_test.rb
index eb63fa299..3f6228bc5 100644
--- a/test/api/comments/extension_test.rb
+++ b/test/api/comments/extension_test.rb
@@ -33,7 +33,7 @@ def test_extension_application
       })
     td.save!
     data_to_post = {
-      weeks_requested: '1',
+      days_requested: '7',
       comment: "I need a lot of help"
     }
 
@@ -44,12 +44,12 @@ def test_extension_application
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 201, last_response.status
-    assert response["weeks_requested"] == 1, "Error: Deadline less than a week, requested weeks should be 1, found #{response["weeks_requested"]}."
+    assert response["days_requested"] == 1, "Error: Requested days should be 1, found #{response["days_requested"]}."
 
     # Request a 2 week extension on the day
     td.due_date = Time.zone.now + 2.weeks
     td.save!
-    data_to_post["weeks_requested"] = '2'
+    data_to_post["days_requested"] = '14'
 
     # Add auth_token and username to header
     add_auth_header_for(user: user)
@@ -57,13 +57,13 @@ def test_extension_application
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 201, last_response.status
-    assert response["weeks_requested"] == 2, "Error: Weeks requested weeks should be 2, found #{response["weeks_requested"]}."
+    assert response["days_requested"] == 14, "Error: Days requested should be 14, found #{response["days_requested"]}."
 
     # Add auth_token and username to header
     add_auth_header_for(user: user)
 
     # Ask for too long an extension
-    data_to_post["weeks_requested"] = '5'
+    data_to_post["days_requested"] = '35'
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 403, last_response.status, "Error: Allowed too long of a request to be applied."
@@ -72,11 +72,11 @@ def test_extension_application
     # Add auth_token and username to header
     add_auth_header_for(user: user)
 
-    # Ask for 0 week extension
-    data_to_post["weeks_requested"] = '0'
+    # Ask for 0 day extension
+    data_to_post["days_requested"] = '0'
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
-    assert_equal 403, last_response.status, "Error: Should not allow 0 week extension requests"
+    assert_equal 403, last_response.status, "Error: Should not allow 0 day extension requests"
 
     td.destroy!
     unit.destroy!
@@ -110,7 +110,7 @@ def test_extension_application
 
     main_tutor = project.tutor_for(td)
     data_to_post = {
-      weeks_requested: '1',
+      days_requested: '7',
       comment: "I need a lot of help"
     }
 
@@ -121,7 +121,7 @@ def test_extension_application
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 201, last_response.status
-    assert response["weeks_requested"] == 1, "Error: Deadline less than a week, requested weeks should be 1, found #{response["weeks_requested"]}."
+    assert response["days_requested"] == 2, "Error: deadline is in 2 days, requested days should be 2, found #{response["days_requested"]}."
 
     tc = TaskComment.find(response['id'])
 
@@ -168,7 +168,7 @@ def test_disallow_student_extensions
 
     main_tutor = project.tutor_for(td)
     data_to_post = {
-      weeks_requested: '1',
+      days_requested: '7',
       comment: "I need a lot of help"
     }
 
@@ -182,7 +182,7 @@ def test_disallow_student_extensions
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 201, last_response.status
-    assert response["weeks_requested"] == 1, "Error: Deadline less than a week, requested weeks should be 1, found #{response["weeks_requested"]}."
+    assert response["days_requested"] == 2, "Error: Deadline less than 7 days, requested days should be 2, found #{response["days_requested"]}."
 
     tc = ExtensionComment.find(response['id'])
 
@@ -195,7 +195,7 @@ def test_disallow_student_extensions
   end
 
   def test_extension_on_resubmit
-    unit = FactoryBot.create(:unit, extension_weeks_on_resubmit_request: 2)
+    unit = FactoryBot.create(:unit, extension_days_on_resubmit_request: 14)
     td = TaskDefinition.new({
         unit_id: unit.id,
         tutorial_stream: unit.tutorial_streams.first,
@@ -231,14 +231,14 @@ def test_extension_on_resubmit
     # Get the task... check it is ready for feedback
     task = project.task_for_task_definition(td)
     assert_equal TaskStatus.ready_for_feedback, task.task_status
-    assert_equal 3, task.weeks_can_extend
+    assert_equal 21, task.days_can_extend
     assert task.can_apply_for_extension?
 
     # Ask for resubmit
     task.assess TaskStatus.fix_and_resubmit, tutor
 
     # Now check that the 2 weeks was added
-    assert_equal 1, task.weeks_can_extend
+    assert_equal 7, task.days_can_extend
 
     td.destroy
     unit.destroy
@@ -272,7 +272,7 @@ def test_extension_in_inbox
     td.save!
 
     data_to_post = {
-      weeks_requested: '1',
+      days_requested: '7',
       comment: "I need a lot of help"
     }
 
@@ -284,7 +284,7 @@ def test_extension_in_inbox
     post_json "/api/projects/#{project.id}/task_def_id/#{td.id}/request_extension", data_to_post
     response = last_response_body
     assert_equal 201, last_response.status
-    assert response["weeks_requested"] == 1, "Error: Deadline less than a week, requested weeks should be 1, found #{response["weeks_requested"]}."
+    assert response["days_requested"] == 7, "Error: requested weeks should be 1, found #{response["days_requested"]}."
 
     unit.reload
     task = unit.tasks.last
diff --git a/test/api/groups_api_test.rb b/test/api/groups_api_test.rb
index a2759f227..0b3ea3f5e 100644
--- a/test/api/groups_api_test.rb
+++ b/test/api/groups_api_test.rb
@@ -50,7 +50,7 @@ def test_group_submission_with_extensions
 
     data_to_post = {
       comment: 'I need more time',
-      weeks_requested: 2
+      days_requested: 14
     }
 
     project = group.projects.first
diff --git a/test/api/tasks_api_test.rb b/test/api/tasks_api_test.rb
index b76e467ea..3a65ffb6a 100644
--- a/test/api/tasks_api_test.rb
+++ b/test/api/tasks_api_test.rb
@@ -152,13 +152,13 @@ def test_extension_reverts_time_exceeded
     # Get the task... check it is now time exceeded
     task = project.task_for_task_definition(td)
     assert_equal TaskStatus.time_exceeded, task.task_status
-    assert_equal 2, task.weeks_can_extend
+    assert_equal 14, task.days_can_extend
     assert task.can_apply_for_extension?
     refute task.submitted_before_due?
 
     data_to_post = {
       comment: 'Help me!',
-      weeks_requested: 2
+      days_requested: 14
     }
 
     # Add username and auth_token to Header
@@ -181,9 +181,9 @@ def test_extension_reverts_time_exceeded
 
     # After extension... no more extensions are possible
     task.reload
-    assert_equal 0, task.weeks_can_extend
+    assert_equal 0, task.days_can_extend
     refute task.can_apply_for_extension?
-    assert_equal 2, task.extensions
+    assert_equal 14, task.extensions
     assert task.submitted_before_due?
 
     assert_equal TaskStatus.ready_for_feedback, task.task_status
@@ -230,13 +230,13 @@ def test_extension_reverts_time_exceeded_auto_apply
     # Get the task... check it is now time exceeded
     task = project.task_for_task_definition(td)
     assert_equal TaskStatus.time_exceeded, task.task_status
-    assert_equal 2, task.weeks_can_extend
+    assert_equal 14, task.days_can_extend
     assert task.can_apply_for_extension?
     refute task.submitted_before_due?
 
     data_to_post = {
       comment: 'Help me!',
-      weeks_requested: 2
+      days_requested: 14
     }
 
     # Add username and auth_token to Header
@@ -248,9 +248,9 @@ def test_extension_reverts_time_exceeded_auto_apply
 
     # After extension... no more extensions are possible
     task.reload
-    assert_equal 0, task.weeks_can_extend
+    assert_equal 0, task.days_can_extend
     refute task.can_apply_for_extension?
-    assert_equal 2, task.extensions
+    assert_equal 14, task.extensions
     assert task.submitted_before_due?
 
     assert_equal TaskStatus.ready_for_feedback, task.task_status
diff --git a/test/api/units_api_test.rb b/test/api/units_api_test.rb
index 2fd2cf7d2..da49829a0 100644
--- a/test/api/units_api_test.rb
+++ b/test/api/units_api_test.rb
@@ -232,7 +232,7 @@ def test_unit_output()
     assert_equal actual_unit['start_date'].to_date, expected_unit.start_date.to_date
     assert_equal actual_unit['end_date'].to_date, expected_unit.end_date.to_date
 
-    keys = ["code", "id", "name", "main_convenor_id", "description", "active", "auto_apply_extension_before_deadline", "send_notifications", "enable_sync_enrolments", "enable_sync_timetable", "draft_task_definition_id", "allow_student_extension_requests", "extension_weeks_on_resubmit_request", "allow_student_change_tutorial"]
+    keys = ["code", "id", "name", "main_convenor_id", "description", "active", "auto_apply_extension_before_deadline", "send_notifications", "enable_sync_enrolments", "enable_sync_timetable", "draft_task_definition_id", "allow_student_extension_requests", "extension_days_on_resubmit_request", "allow_student_change_tutorial"]
 
     assert actual_unit.key?("my_role"), actual_unit.inspect
     assert_equal expected_unit.role_for(expected_unit.main_convenor_user).name, actual_unit["my_role"]
diff --git a/test/models/group_test.rb b/test/models/group_test.rb
index 3a9cfad58..e732399f0 100644
--- a/test/models/group_test.rb
+++ b/test/models/group_test.rb
@@ -175,7 +175,7 @@ def test_submit_with_others_having_extensions
     t2 = p2.task_for_task_definition(td)
     t3 = p3.task_for_task_definition(td)
 
-    duration = t1.weeks_can_extend
+    duration = t1.days_can_extend
 
     t1.apply_for_extension(p1.student, "Test comment", duration)
     t1.reload
@@ -193,7 +193,7 @@ def test_submit_with_others_having_extensions
     t3.reload
 
     assert t2.valid?
-    assert_equal 2, t1.extensions
+    assert_equal 14, t1.extensions
     assert_equal 0, t2.extensions
     assert_equal :ready_for_feedback, t1.status
     assert_equal :ready_for_feedback, t2.status
@@ -212,7 +212,7 @@ def test_submit_with_others_having_extensions
     assert t2.valid?
     assert_equal :complete, t1.status
     assert_equal :complete, t2.status
-    assert_equal 2, t1.extensions
+    assert_equal 14, t1.extensions
     assert_equal 0, t2.extensions
     assert_equal 1, t1.comments.count
     assert_equal 2, t2.comments.count
diff --git a/test/models/webcal_test.rb b/test/models/webcal_test.rb
index 31b58159d..96bb2a976 100644
--- a/test/models/webcal_test.rb
+++ b/test/models/webcal_test.rb
@@ -114,7 +114,7 @@ class WebcalTest < ActiveSupport::TestCase
     # Apply for an extension on one task
     td = @current_unit_1.task_definitions.first
     task = @current_project_1.task_for_task_definition(td)
-    comment = task.apply_for_extension(@student, 'extension', 1)
+    comment = task.apply_for_extension(@student, 'extension', 7)
 
     # Detect corresponding Ical event
     cal = @webcal.to_ical
@@ -159,7 +159,7 @@ class WebcalTest < ActiveSupport::TestCase
     checks.each do |check|
       @webcal.update(reminder_time: time, reminder_unit: check[:unit])
       cal = @webcal.to_ical
-  
+
       per_task_def.call do |td, ev|
 
         assert_equal 1, ev.alarms.count, 'Error: Specified alarm does not exist.'