Set timer for 18 min. Start the online timer set for 18 minutes. You can also add or subtract time. 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 counting upward 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.