To Update Your Campaign App Duration
1. Go to the 'Displays' tab, and select the Display you want to update your campaign app duration.
2. Then click on the campaign you want to update your app duration on the 'Schedule' tab.
3. Scroll down and click on the campaign app you want to update, then click 'Change Duration'.
4. You can then change your app's duration, then hit 'Set' to save changes.