Some tasks need exactly 5 days. Instead of checking the clock again and again, let the 120 Hour Timer keep track for you. It runs right here in your browser and alerts you the moment time is up.
Practical Uses for a 120 Hour Timer
A countdown of 5 days works well for situations like these:
- Moving Day: Count down to moving day and split packing, cleaning and paperwork into manageable steps.
- Exam Countdown: See how many days are left until the exam and plan your revision backwards from the deadline.
- Shipping & Returns: Track return windows, trial periods or delivery promises so you never miss the deadline.
- Sourdough Starter: A new sourdough starter needs about 5 to 7 days of regular feeding, a perfect job for a multi-day countdown.
- Fermentation: Sauerkraut, kimchi and kombucha ferment for days to weeks, and the 120 hour timer reminds you when to taste.
Fun Fact About 120 Hours
Apollo 8, the first crewed flight around the Moon in December 1968, lasted about 147 hours. This 120 hour timer ends 27 hours and 1 minute earlier.
In Roman numerals, 120 is written as CXX.
How to Set a 120 Hour Timer
- Everything is prepared: 5d 00:00:00 is already entered, so one click on Start Timer is enough.
- Type a short note into the text field so you remember what the 120 hours are for, and keep the alarm switched on.
- Combine the 120-hour block with breaks or other phases by adding timers; the whole sequence runs on its own.
- Switch to fullscreen for big digits and save your configuration with Export Settings to load it again later.
Tip for long timers: leave the page open in a pinned tab and keep your device charging. The timer uses the actual clock time, so it stays accurate for the full 5 days.
Recommended Timers for Specific Activities
These use case timers come with complete, pre-configured sequences:
- Learning a new language? The Language Learning Timer splits vocabulary, grammar and speaking practice.
- Creators plan writing, filming and editing with the Content Creation Timer.
- For structured workout sessions, try the HIIT Workout Timer with work and rest intervals.
- For focused work with planned breaks, use the Pomodoro Timer.
Explore More Timers
Frequently Asked Questions About the 120 Hour Timer
How long is a 120 hour timer?
A 120 hour timer runs for exactly 5 days. That equals 432,000 seconds or 7,200 minutes.
Can I pause or repeat the 120 hour timer?
You can pause at any moment (also with the space bar) and resume exactly where you stopped. To run the 120 hours several times, switch on Repeat Timer and choose how often.
Will I hear an alarm when the time is up?
Activate Enable Alarm, pick one of the 13 sounds and the 120 hour timer will ring when it reaches zero. Make sure the tab stays open and your device is not muted.
Does the timer keep running if my computer goes to sleep?
The countdown is calculated from the real clock time. If your device sleeps, the display jumps to the correct remaining time when it wakes up. The alarm itself can only play while the device is awake, so for long timers keep it plugged in and disable sleep mode. If you reload the page, FinalTimer offers to resume the running timer.
Make the Most of 120 Hours
Ready? Press Start Timer and let the 120 hour timer do the counting. When the 120 hours are over, the alarm and your final message will let you know on desktop, tablet or phone.
Plan Your 120 Hours
Numbers that help you use the 120 hour timer in practice, all calculated for exactly 5 days.
When Does a 120-Hour Countdown End?
For long countdowns the weekday matters. If you start the timer on …
| Start | Timer ends |
|---|---|
| Monday 08:00 | Saturday 08:00 (5 days later) |
| Wednesday 12:00 | Monday 12:00 (5 days later) |
| Friday 18:00 | Wednesday 18:00 (5 days later) |
| Sunday 21:00 | Friday 21:00 (5 days later) |
Countdown Milestones
- A quarter done: after 30 hours, with 3 days and 18 hours remaining.
- Halfway point: after 2 days and 12 hours, with 2 days and 12 hours remaining.
- Three quarters done: after 3 days and 18 hours, with 30 hours remaining.
- Last 10 percent: after 4 days and 12 hours, with 12 hours remaining.
For long countdowns, checking in at these points helps you see whether you are on schedule.
Intervals That Fit Into 120 Hours
- Days: 5 full days.
- Sleep: enough time for 5 nights of 8 hours sleep, in total 40 hours of rest.
- Work: the same number of hours as 15 eight-hour workdays, or 3 full 40-hour workweeks.
120 Hours Compared With Real-World Durations
- 3.82 days: Radon-222, a natural radioactive gas, has a half-life of about 3.8 days. (28 hours and 19 minutes shorter than this timer)
- 5.95 days: The dramatic Apollo 13 mission of April 1970 lasted 142 hours and 54 minutes. (22 hours and 54 minutes longer than this timer)
- 6 days: Building a new sourdough starter from flour and water usually takes about five to seven days. (24 hours longer than this timer)
- 6.13 days: Apollo 8, the first crewed flight around the Moon in December 1968, lasted about 147 hours. (27 hours and 1 minute longer than this timer)
- 6.39 days: A day on Pluto lasts about 6.4 Earth days, or roughly 153 hours. (33 hours and 18 minutes longer than this timer)