diff --git a/backend/src/main/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandler.java b/backend/src/main/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandler.java
index 4afc6a3f..d3560be2 100644
--- a/backend/src/main/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandler.java
+++ b/backend/src/main/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandler.java
@@ -9,6 +9,7 @@
 import jakarta.servlet.http.HttpServletResponse;
 import java.io.IOException;
 import java.net.URLEncoder;
+import java.time.Duration;
 import java.util.Optional;
 import java.util.stream.Stream;
 import lombok.extern.slf4j.Slf4j;
@@ -38,9 +39,9 @@ public class GithubAuthenticationSuccessHandler extends SimpleUrlAuthenticationS
   private static final String ACCESS_TOKEN = "access_token";
   private static final String REFRESH_TOKEN = "refresh_token";
 
-  private static final int ONE_DAY = 60 * 60 * 24;
-  private static final int SEVEN_HOURS = 60 * 60 * 7;
-  private static final int FIVE_MONTHS = 60 * 60 * 24 * 30 * 5;
+  private static final int ONE_DAY = Math.toIntExact(Duration.ofDays(1).toSeconds());
+  private static final int SEVEN_HOURS = Math.toIntExact(Duration.ofHours(7).toSeconds());
+  private static final int FIVE_MONTHS = Math.toIntExact(Duration.ofDays(150).toSeconds());
 
   private final OAuth2AuthorizedClientService clientService;
   private final String contextPath;
diff --git a/backend/src/test/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandlerTest.java b/backend/src/test/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandlerTest.java
index 6431e9e7..bc7af049 100644
--- a/backend/src/test/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandlerTest.java
+++ b/backend/src/test/java/de/otto/platform/gitactionboard/config/security/GithubAuthenticationSuccessHandlerTest.java
@@ -11,6 +11,7 @@
 import jakarta.servlet.http.HttpServletRequest;
 import jakarta.servlet.http.HttpServletResponse;
 import java.net.URLEncoder;
+import java.time.Duration;
 import lombok.SneakyThrows;
 import org.junit.jupiter.api.BeforeEach;
 import org.junit.jupiter.api.Test;
@@ -45,9 +46,9 @@ class GithubAuthenticationSuccessHandlerTest {
   private static final String ACCESS_TOKEN = "access_token";
   private static final String REFRESH_TOKEN = "refresh_token";
 
-  private static final int ONE_DAY = 60 * 60 * 24;
-  private static final int SEVEN_HOURS = 60 * 60 * 7;
-  private static final int FIVE_MONTHS = 60 * 60 * 24 * 30 * 5;
+  private static final int ONE_DAY = Math.toIntExact(Duration.ofDays(1).toSeconds());
+  private static final int SEVEN_HOURS = Math.toIntExact(Duration.ofHours(7).toSeconds());
+  private static final int FIVE_MONTHS = Math.toIntExact(Duration.ofDays(150).toSeconds());
 
   private GithubAuthenticationSuccessHandler authenticationSuccessHandler;