A twenty-five minute timer

This page starts counting 25 minutes the moment it opens, and makes a sound when it finishes. Nothing to set, and nothing to press first.

What people set 25 minutes for

One block of focused work, phone elsewhere, one task only until it rings.

Worth knowing

Twenty-five minutes is short enough that starting feels cheap and long enough to reach real concentration — but the number matters far less than never interrupting it.

Questions

Do the timers keep running if I switch tabs?

Yes. The countdown is measured against a monotonic clock rather than counted in ticks, so a backgrounded tab, a throttled timer or a laptop lid closing does not lose time — when you come back it shows what it should, not what it managed to count.

Does a timer survive a daylight-saving change?

Yes, and the distinction matters. A countdown measures elapsed real time, so a timer set for six hours across a spring-forward still runs six real hours even though the wall clock advances seven. An alarm set for a wall-clock time does the opposite: it fires when the clock says so, which is what you want from an alarm.