Set a timer for 90 seconds to wake you up in 90 seconds. This is a free and easy-to-use countdown timer that allows you to set the hour, minute, and second for the online countdown. Simply start the timer, and it will alert you when 90 seconds have passed. Alternatively, you can set a specific date and time to count down to (or from) an event. Begin your 90 seconds timer now for a quick and precise reminder.