Take Advantage of Screen Time
Screen Time lets you monitor and control your and your family’s device usage, and is controlled from Settings > Screen Time.
To enable Screen Time, tap Turn on Screen Time on that screen. You’re asked if you’re setting up the device for you or a child, which you can change later.
After you’ve turned on Screen Time, there are a couple of more settings you might want to consider:
Do you want to set a Screen Time passcode, which must be entered to change Screen Time settings or override limits? If you’re the only person to use the device, it’s probably not worth it unless you need additional friction to enforce self-discipline, but if your kids use the device it might be a good idea. You can set that with Use Screen ...