Growlytics SDK also starts tracking user sessions with this basic setup. Upon app backgrounding, the SDK marks the current time. If the user returns to the app after more than 15 seconds since the user had last backgrounded the app, the SDK will close the previous session. If the user foregrounds the app within 15 seconds of the previous backgrounding, the previous session is resumed as if the user did not leave the app at all. Also, if the user force kills the app and launches it again after being force killed (irrespective of the time duration between force kill and launch), the SDK will close the previous session upon force-kill and start a new session upon app launch.