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How to keep your tablet or phone awake
You can turn the Auto Lock feature to never. I don't know of an app that will do it.
Go to Settings -> General -> AutoLock = Never
The best way I've found is to download an app called "Stay Alive". It has many options and the free version works just fine. It can be found at https://play.google.com/store/apps/details?id=com.synetics.stay.alive