How to Adjust the Screen Timeout on Your Samsung Galaxy Tab S
You can manually lock your Galaxy Tab at any time by pressing the Power Lock key. That’s why it’s called the Power Lock key. When you don’t manually lock the tablet, it automatically locks itself after a given period of inactivity.
You have control over the automatic lock timeout value, which can be set from 15 seconds to several minutes. Obey these steps:
Open the Settings app.
Tap the Device tab, and choose Display from the left side of the screen.
On the right side of the screen, choose Screen Timeout.
Select a timeout value from the list.
The standard value is 30 seconds.
The Screen Timeout measures inactivity; when you don’t touch the screen or tap an icon or a button, the timer starts ticking. About 5 seconds before the timeout value you set (in Step 4), the touchscreen dims. Then it turns off, and the tablet locks. If you touch the screen before then, the timer is reset.
The Lock screen has its own timeout. If you unlock the tablet but don’t work the screen lock, the tablet locks itself automatically after about 10 seconds.