The lock timer starts as soon as the LG screen is turned off, giving the user 5 seconds as standard to wake up the screen from sleep mode without having to unlock the screen lock. The time between turning off the screen and actually locking the LG can be adjusted between 0 seconds (instant) and 30 minutes.

Note: If the "Show lockdown button" function is activated immediately, the timer will not start.

Android 9 | LG UX 9.0
Step 1:  Open the  Settings
Step 2:  Tap on  General
Step 3:  Tap on  Lock screen & security
Step 4:  Tap on  Secure lock settings
Step 5:  Tap on  Lock timer
Step 6:  Choose desired  Time
  1. Open the Settings
  2. Tap on General
  3. Tap on Lock screen & security
  4. Tap on Secure lock settings
  5. Tap on Lock timer
  6. Choose desired Time

LG Instructions