Set 72 Hours Timer Online
Set timer for 72 Hours directly in your browser. This free online countdown clock counts down from 72 hours to zero and plays a loud alarm when time is up. To start the timer, simply click the Start button above.
Popular Uses
- 3-Day Product Launch Sprint - count down 72 hours from your first announcement to a public product or service launch.
- Long Cold-Ferment Dough - cold-ferment pizza dough or sourdough for up to 72 hours in the refrigerator for peak depth of flavor.
- Emergency Preparedness Rule - preparedness guidelines recommend 72 hours of self-sufficient supplies for post-disaster situations.
- Weekend Project Countdown - start Friday evening and track how much you accomplish before Monday morning arrives.
- Medical Observation Window - track a 72-hour elimination diet, medication observation period, or hydration challenge protocol.
Frequently Asked Questions
Does this 72 hours timer make a sound?
Yes. When the countdown reaches zero, the browser plays a short alarm chime. Keep the tab open and your device volume enabled.
Can I use this timer in full screen?
Yes. Use the full-screen button to turn the countdown into a large display for classrooms, workouts, meetings, cooking, or livestreams.
How many seconds is this timer?
This countdown is exactly 259,200 seconds long.
More Timer Durations
Need a different time? Select from our quick preset timers below.
Seconds:
Minutes: