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Using the 100 Minutes Timer

This timer is already set to 100 minutes. Press Start Timer when you are ready, keep the browser tab open, and use the sound selector or full-screen view if you need a clearer alert.

100 Minutes sits in the extended timer range - about 166.7% of an hour, and it runs past the hour mark at 1.67 hours. That length suits a film, a long study or work session, or slow cooking or roasting, so pick one job before you press Start and let the countdown protect it. When you need a few of these running side by side, the multi-timer keeps them all on one screen.

A timer measures a length, not a clock time. If what you really want is an alert at a set moment - a meeting, a wake-up, a pickup - an online alarm is the better fit, and you can keep both open at once. For anything you would rather measure going up instead of down, like laps or how long a chore actually takes, switch to the stopwatch.

Precisely, 100 Minutes is 6,000 seconds (1 hour 40 minutes). The countdown runs in this browser tab, so keeping the tab open and the device awake is what lets it ring on time - give longer timers a quick sound check before you step away.

Before you start a 100 Minutes timer

100 Minutes is an extended countdown, so it is best for slow cooking, long study blocks, travel reminders, or project work.

A 100 Minutes timer runs for 1.67 hours (1 hour 40 minutes). Use the first third to start, the middle third to do the work, and the last third to wrap up before the alert.

1 hour 40 minutes (6,000 seconds)
166.7% of an hour

100 Minutes planning table

Moment	Use it for	Practical cue
Before starting	Prepare for a film	Plug in the device, keep the tab open, and test the alert sound.
Halfway check	Review progress on a long study or work session	If the task changed, pause and rename the timer so it still matches the goal.
When it rings	Wrap up slow cooking or roasting	Stop, save, stir, stretch, or move to the next planned block.

100 Minutes pace checkpoints

A 100 Minutes countdown is easiest to use when it has checkpoints. Think of it as about three blocks of 33 minutes: start the task, stay with the middle, then leave enough time to close it properly.

Checkpoint	When it happens	What to decide
Quarter check	25 minutes after start	1 hour 15 minutes left to keep the task moving.
Halfway check	50 minutes after start	50 minutes left to decide whether to finish or simplify.
Final cue	1 hour 35 minutes after start	5 minutes left for saving, wiping down, stretching, or stopping cleanly.

How to make 100 Minutes useful

Use 100 Minutes for a single named task, not a mixed checklist.
If the task needs setup, spend no more than 25 minutes preparing before the real work begins.
At the halfway mark, ask whether the goal still fits inside the remaining 50 minutes.

When this duration is not ideal

For important reminders after 100 Minutes, use a backup alarm on another device. Browser timers depend on the tab staying open.

For longer sessions, set this timer and step away from the clock - You'll be alerted the moment it ends, so you can stay in flow.