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4 Hour Timer
Your 4:00:00 countdown is ready: press Start (or Space) and the alarm sounds after four hours. Useful for slow cookers, long exams and parking limits.
Last updated:
4:00:00
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?m=180 to the address for a custom length. Keep this tab open; the countdown stays accurate in the background.
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How to use the 4 Hour Timer
- Press Start or hit the Space bar. The 4:00:00 countdown begins immediately.
- Want a reminder midway? Tick Soft chime at the halfway mark to hear a gentle chime at 2:00:00 left.
- Fine-tune the length with the ± buttons or pick another preset.
- Choose an alarm sound and volume, then press Play test sound to check you can hear it.
- When time is up, press Stop alarm or Space. Press R to reset to 4:00:00.
How long is 4 hour?
| Measure | 4 Hour equals |
|---|---|
| Minutes | 240 min |
| Seconds | 14,400 s |
| Milliseconds | 14,400,000 ms |
| Hours | 4 h |
| Share of a day | 16.7% (1/6 of a day) |
| Walking at 5 km/h (3.1 mph) | about 20 km (12 mi) |
| Speaking at 130 words per minute | about 31,200 words |
| Reading at 230 words per minute | about 55,200 words |
What you can do in 4 hour
| Activity | Why 4 hour works |
|---|---|
| Slow cooker (high) | Many slow-cooker recipes take about 4 hours on high |
| Long exam | Some professional exams run 4 hours |
| Parking limit | A reminder for a 4 hour parking zone |
| Study session | A long revision block with breaks |
| Marathon | Many first-time marathoners finish in 4 to 5 hours |
| Pork shoulder (oven) | Low and slow roasting |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 14,400,000 ms on the browser's monotonic clock (performance.now()). Every screen update subtracts the current time from that end moment instead of counting ticks, so a throttled background tab or a busy computer cannot make it fall behind. Pausing stores the time left, and Resume sets a new end moment that far in the future.
Frequently asked questions
How do I set a timer for 4 hours?
The timer opens at 4:00:00. Press Start or the Space bar and it rings when it reaches zero.
How many minutes and seconds are in 4 hours?
4 hours is 240 minutes, 14,400 seconds or 14,400,000 milliseconds.
Can I take breaks with a 4 hour timer?
Yes. Turn on the halfway chime to get a reminder at 2:00:00 left, or press Pause and Resume as needed.
Will the timer stay accurate for four hours?
Yes, as long as the tab stays open and the device does not sleep. It always works out the time left from the clock, so it cannot drift. Keep laptops plugged in with sleep turned off.
When does the halfway chime play?
If switched on, it plays once when 2:00:00 is left.
Why do the buttons change by 5 minutes?
For long timers, ±5 min steps are quicker. Use the presets or ?m= in the address for an exact number of minutes.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.
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