Once a user of a Backendless-powered app logs in, a session is established. The session has an inactivity timeout that is reset with every new API call made within the session. The default timeout value is 3600 seconds (1 hour). It means Backendless will keep a session alive 1 hour after the most recent API request. The inactivity timeout value is configurable in Backendless console:
The Enable Session Timeout configuration is located under Users > Login. The default setting if the configuration property is OFF. In that case, the inactivity timeout is set to 3600 as described above. To change the setting, enter a timeout value in the inactivity timeout textbox and click the toggle to set it to the ON state. The maximum allowed value is 30 days, which is 2592000 seconds.