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The Xiaomi smartphone can automatically go into standby or sleep mode after a certain time of inactivity, with a minimum of 15 seconds to a maximum of 10 minutes.

Note: If a lock screen password or fingerprint is set as the unlock method on the device, it is required to unlock the device in order to use it again.

Android 11 | MIUI 12.0
Step 1: Tap on  Settings
Step 2: Tap on  Always-on display & Lock screen
Step 3: Tap on  Sleep
Step 4: Set a  sleep timer
  1. Tap on Settings
  2. Tap on Always-on display & Lock screen
  3. Tap on Sleep
  4. Set a sleep timer
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Xiaomi Instructions