Wake me up in 20 minutes 40 seconds. Set timer for 20 minutes 40 seconds. Set the alarm for 20 minutes 40 seconds from now. It is a free and easy-to-use countdown timer.
Set this 20 minutes 40 seconds timer and let the countdown start. Use it to control the time limit of any activity and be notified when that limit has been reached. When the countdown stops, an alarm sound will ring.
Start 20 minutes 40 seconds timer.