Where in the iPhone six settings do I go to set for how long the phone sleeps? I need a stat by step guide?

Where in the iPhone six settings do I go to set for how long the phone sleeps? I need a stat by step guide?

I'm not sure if this is what you meant, but to change the amount of time before your phone falls asleep
1:Open settings
2:Click on Display & Brightness
3:Then on Auto-lock
4:Then choose your time.
(If it won't let you do so, go to control center and click Allow Changes).
And if you meant to change how long your phone is asleep, you can't. It won't wake up again after being asleep for so long unless you awaken it.

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