When you finish using your iPhone or iPad, it will, after a certain period of time, lock up. It will do this after a period of inactivity. This is obviously a good thing for security purposes, and of course, by shutting down your device it helps save battery life, as well.
But it is completely up to you WHEN you want your iPhone or iPad to shut down. Some people like it to shut down quickly once they stop using it, while others may prefer some wait time of 2 minutes, 4 minutes or perhaps ….. never.
Here is how to set the auto-lock time for your iPhone or iPad:
Go to Settings
Once you open Settings, tap on General.
Now scroll down to find “Auto-Lock.”
Tap on “Auto-lock.”
You will see the screen below. Touch to select your choice of minutes (or never).
That’s it! You’re done …. and the next time your iPhone or iPad is inactive, it will shut down according to the time you just chose.