20-Minute Timer
Check out this 20-Minute Timer with a notification sound when the time runs out.
This timer video has a 10 second buffer at the end, so the video time is 10 seconds longer than the timer.
Check out this playlist for more timers: • Timers
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Hopefully this video is what you're looking for when it comes to a timer!
Have a great rest of your day! ✌️✌️✌️