How to Delay the Screen Lock on Your Android Phone
Your Android phone can be configured to automatically lock after a given period of inactivity. Even so, the phone may not lock right away after a screen timeout. Instead, there is a brief delay, which allows you to wake up the phone right away without having to work the screen lock. The setting is called Automatically Lock.
To adjust the automatic lock, open the Settings app and choose the Security or Lock Screen item. Choose Automatically Lock to set how long the touchscreen waits to lock after the phone’s touchscreen display has a timeout.
The Automatically Lock item appears only when a secure screen lock is set, so if you don’t see it, first set a secure lock. The value can be adjusted from Immediately to 30 minutes. The standard value is typically 5 seconds.
The Automatically Lock setting isn’t enforced when you manually lock the phone: Pressing the Power/Lock key always locks the phone, applying whatever lock screen security you’ve set. But when the screen times out, the Automatically Lock delay value is used, which saves some time should the phone try to snooze on you.