45 Seconds Timer — Free Online Countdown | TimerRushFree 45 seconds countdown timer with millisecond precision. Works instantly in any browser. Bookmark /t/45s for one-click access.Frequently asked questionsWhat is a 45s timer useful for?A 45s timer is great for quick exercises, brushing teeth, or short timed bursts. Start it and focus — the alarm signals when time is up.Does the timer keep running if I switch tabs?Yes — TimerRush continues counting down in the background and plays an alarm when finished.Can I bookmark this timer?Yes. Bookmark this page to return to this exact timer instantly. No account or signup needed.Is TimerRush free to use?Completely free. No account, no download, no ads. Works in any modern browser on any device.