3 hours
The 3-hour online timer displays the remaining time in large numbers and automatically converts 3 hours to minutes and seconds. Control is implemented through clear start, pause, and reset buttons. One click - and the timer expands to the full screen. At the end of the period, the configured audio signal sounds, which can be turned off if desired.
The timer works correctly on any device and continues counting down when switching between tabs. The time until completion is visible in the browser header, so that the end time will not be missed.