Wake me up in 18 minutes 30 seconds. Set timer for 18 minutes 30 seconds. Set the alarm for 18 minutes 30 seconds from now. It is a free and easy-to-use countdown timer.
Set this 18 minutes 30 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 18 minutes 30 seconds timer.