diff --git a/application/forms/EventRuleConfigElements/EscalationCondition.php b/application/forms/EventRuleConfigElements/EscalationCondition.php
index 4e1c0b865..c84404163 100644
--- a/application/forms/EventRuleConfigElements/EscalationCondition.php
+++ b/application/forms/EventRuleConfigElements/EscalationCondition.php
@@ -106,6 +106,7 @@ protected function assemble(): void
                 ]
             );
 
+            $valUnit = null;
             switch ($this->getPopulatedValue('column_' . $i)) {
                 case 'incident_severity':
                     $val = $this->createElement(
@@ -130,28 +131,25 @@ protected function assemble(): void
                     break;
                 case 'incident_age':
                     $val = $this->createElement(
-                        'text',
+                        'number',
                         $valName,
                         [
                             'required'   => true,
-                            'class'      => ['autosubmit', 'right-operand'],
-                            'validators' => [
-                                new CallbackValidator(function ($value, $validator) {
-                                    if (! preg_match('~^\d+(?:\.?\d*)?[hms]{1}$~', $value)) {
-                                        $validator->addMessage(
-                                            $this->translate(
-                                                'Only numbers with optional fractions (separated by a dot)'
-                                                . ' and one of these suffixes are allowed: h, m, s'
-                                            )
-                                        );
-
-                                        return false;
-                                    }
-
-                                    $validator->clearMessages();
-                                    return true;
-                                })
-                            ]
+                            'class'      => ['right-operand'],
+                            'value'      => 1
+                        ]
+                    );
+
+                    $valUnit = $this->createElement(
+                        'select',
+                        'age_unit_' . $i,
+                        [
+                            'options' => [
+                                's' => 's',
+                                'm' => 'm',
+                                'h' => 'h'
+                            ],
+                            'class'   => 'age-unit'
                         ]
                     );
 
@@ -167,6 +165,9 @@ protected function assemble(): void
             $this->registerElement($col);
             $this->registerElement($op);
             $this->registerElement($val);
+            if ($valUnit) {
+                $this->registerElement($valUnit);
+            }
 
             (new EventRuleDecorator())->decorate($val);
             $this->conditions[$i] = new EscalationConditionListItem($col, $op, $val, $this->createRemoveButton($i));
@@ -268,7 +269,8 @@ public function getCondition(): string
 
                 $filterStr = $chosenType
                     . $this->getValue('operator_' . $count)
-                    . ($this->getValue('val_' . $count) ?? ($chosenType === 'incident_severity' ? 'ok' : ''));
+                    . ($this->getValue('val_' . $count) ?? ($chosenType === 'incident_severity' ? 'ok' : ''))
+                    . $this->getValue('age_unit_' . $count, '');
 
                 $filter->add(QueryString::parse($filterStr));
             }
diff --git a/application/forms/EventRuleConfigForm.php b/application/forms/EventRuleConfigForm.php
index f0a049499..42086b2ad 100644
--- a/application/forms/EventRuleConfigForm.php
+++ b/application/forms/EventRuleConfigForm.php
@@ -333,7 +333,16 @@ public function populate($values): self
                 }
 
                 $conditionFormValues['operator_' . $count] = QueryString::getRuleSymbol($filter);
-                $conditionFormValues['val_' . $count] = $filter->getValue();
+                $conditionValue = $filter->getValue();
+                if (
+                    preg_match('~^(\d+(?:\.?\d*))?([hms])$~', $conditionValue, $matches)
+                    && count($matches) === 3
+                ) {
+                    $conditionFormValues['val_' . $count] = $matches[1];
+                    $conditionFormValues['age_unit_' . $count] = $matches[2];
+                } else {
+                    $conditionFormValues['val_' . $count] = $conditionValue;
+                }
             }
 
             $formValues['escalation-condition_' . bin2hex($position)] = $conditionFormValues;
diff --git a/library/Notifications/Widget/ItemList/EscalationConditionListItem.php b/library/Notifications/Widget/ItemList/EscalationConditionListItem.php
index e21ff873e..3bb0c1d16 100644
--- a/library/Notifications/Widget/ItemList/EscalationConditionListItem.php
+++ b/library/Notifications/Widget/ItemList/EscalationConditionListItem.php
@@ -26,15 +26,20 @@ class EscalationConditionListItem extends BaseHtmlElement
     /** @var FormElement Condition value */
     public $conditionVal;
 
+    /** @var ?FormElement Condition value */
+    public $conditionUnit;
+
     public function __construct(
         FormElement $conditionType,
         FormElement $operator,
         FormElement $conditionVal,
+        ?FormElement $conditionUnit,
         ?SubmitButtonElement $removeButton
     ) {
         $this->conditionType = $conditionType;
         $this->operator = $operator;
         $this->conditionVal = $conditionVal;
+        $this->conditionUnit = $conditionUnit;
         $this->removeButton = $removeButton;
     }
 
@@ -44,6 +49,7 @@ protected function assemble(): void
             $this->conditionType,
             $this->operator,
             $this->conditionVal,
+            $this->conditionUnit,
             $this->removeButton
         ]);
     }
diff --git a/public/css/event-rule-config.less b/public/css/event-rule-config.less
index 241976a90..602d4713f 100644
--- a/public/css/event-rule-config.less
+++ b/public/css/event-rule-config.less
@@ -178,6 +178,12 @@
           margin: 0;
         }
 
+        .age-unit {
+          border-radius: 0.4em;
+          min-width: 3.5em;
+          margin-left: 1px;
+        }
+
         .errors + .remove-button {
           margin: 0;
         }