The LG smartphone has a timer with which we can run down a desired time. after the set time has elapsed, a tone sounds. the maximum time is 99 hours, 59 minutes and 59 seconds. you can't set a longer time for the timer.

Android 9 | LG UX 9.0
Step 1:  Open the  Clock -App
Step 2:  Tap on  Timer
Step 3:  Tap on  Hours, Minutes  or  Seconds
Step 4:  Set  Timer  and tap  Start
  1. Open the Clock-App
  2. Tap on Timer
  3. Tap on Hours, Minutes or Seconds
  4. Set Timer and tap Start

LG Instructions
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