diff --git a/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php b/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
index c708a608f269d48eff7c0c9c951a48d805880ce8..86378fb4bda2e606804e65453f57c27f9c2f5c5a 100644
--- a/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
+++ b/typo3/sysext/core/Classes/Authentication/BackendUserAuthentication.php
@@ -246,7 +246,7 @@ class BackendUserAuthentication extends AbstractUserAuthentication
     public $writeAttemptLog = true;
 
     /**
-     * Session timeout (on the server)
+     * Session timeout (on the server), defaults to 8 hours for backend user
      *
      * If >0: session-timeout in seconds.
      * If <=0: Instant logout after login.
@@ -254,7 +254,7 @@ class BackendUserAuthentication extends AbstractUserAuthentication
      *
      * @var int
      */
-    public $sessionTimeout = 6000;
+    public $sessionTimeout = 28800;
 
     /**
      * @var int
diff --git a/typo3/sysext/core/Configuration/DefaultConfiguration.php b/typo3/sysext/core/Configuration/DefaultConfiguration.php
index 2eb7f92b31788cf735f445cc3f4e422dd42fb82e..2f8b484f8623b01379cf085147a8ef677d20d7f4 100644
--- a/typo3/sysext/core/Configuration/DefaultConfiguration.php
+++ b/typo3/sysext/core/Configuration/DefaultConfiguration.php
@@ -839,7 +839,7 @@ return [
         'warning_email_addr' => '',
         'warning_mode' => '',
         'lockIP' => 4,
-        'sessionTimeout' => 3600,
+        'sessionTimeout' => 28800,  // a backend user logged in for 8 hours
         'IPmaskList' => '',
         'lockBeUserToDBmounts' => true,
         'lockSSL' => false,