Set timer for 18 min. Start the online visual timer set for 18 minutes. Sound alarm notification is optional.
How to use 18 minutes timer
The timer will tell you when your 18 minutes has run out. It will keep alert you and keep counting upwards when time has run out.
Sound notification (alarm) is optional. You can keep the timer running in the background if you for example open a new tab. If you have sound notification the timer will tell you when time is up.
18 minutes equals 1080 seconds or 0.3 of 1 hour.