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90 Minute Timer
A 1:30:00 countdown, ready to go: press Start (or Space) and the alarm sounds after ninety minutes. A full sleep cycle, a soccer match or one long deep-work block fits exactly.
1:30:00
Ready
Presets
Shortcuts: Space start / pause · R reset · F fullscreen. Add ?m=45 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 90 Minute Timer
- Press Start or hit the Space bar. The 1:30:00 countdown begins immediately.
- Want a reminder midway? Tick Soft chime at the halfway mark to hear a gentle chime at 45:00 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 1:30:00.
How long is 90 minute?
| Measure | 90 Minute equals |
|---|---|
| Minutes | 90 min |
| Seconds | 5,400 s |
| Milliseconds | 5,400,000 ms |
| Hours | 1.5 h |
| Share of a day | 6.25% (1/16 of a day) |
| Walking at 5 km/h (3.1 mph) | about 7.5 km (4.7 mi) |
| Speaking at 130 words per minute | about 11,700 words |
| Reading at 230 words per minute | about 20,700 words |
What you can do in 90 minute
| Activity | Why 90 minute works |
|---|---|
| Sleep cycle nap | A full sleep cycle averages about 90 minutes, so you wake between cycles |
| Soccer match | Two 45 minute halves of playing time |
| Ultradian focus block | Many people work in roughly 90 minute focus cycles |
| Exam | Many tests and exam papers last 90 minutes |
| Slow cooking | Braised meats and baked dishes often need about 1.5 hours |
| Movie | Many films run around 90 minutes |
How the countdown keeps exact time
When you press Start, the timer records the end moment as start time + 5,400,000 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 90 minute timer?
It is already set to 1:30:00. Press Start or the Space bar and the alarm rings when it reaches zero.
How many seconds are in 90 minutes?
90 minutes is 1.5 hours, 5,400 seconds or 5,400,000 milliseconds.
Why is a 90 minute nap recommended?
A typical sleep cycle lasts about 90 minutes (it varies from roughly 70 to 120), so waking after a full cycle is less likely to leave you groggy than waking from deep sleep.
Why does the display show 1:30:00?
Times of an hour or more are shown as hours:minutes:seconds; under an hour it switches to minutes:seconds.
When does the halfway chime play?
If switched on, it plays once at 45:00 left.
Can I change the length?
Use −5 min / +5 min, the presets from 30 minutes to 2.5 hours, or ?m= in the address (for example ?m=100).
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