100 Minute Timer

About this one hundred minute timer

This one hundred-minute countdown runs entirely in your browser. A long stretch for sustained focus work, long meditations, or extended study blocks. There is nothing to install, nothing to sign up for, and no data is uploaded when you start, pause, or reset.

How long is 100 minutes? 1 hour and 40 minutes, or 6,000 seconds. That is roughly a feature film, two back-to-back Pomodoro cycles with their breaks, or one long revision block. The clock above is already set to 100:00 — press Start and it runs.

A one hundred-minute timer is a long work block — the kind of session where you can finish a substantive piece of a project, run through a detailed study sheet, or hold a long meditation. Sessions this length benefit from a clear start, a clear goal, and a real break afterwards.

Browsers slow down timers in background tabs to save power, so keep the page visible. If you need to step away, the pause button preserves the remaining time until you return.

How to use this timer

• Press Start (or the spacebar) to begin the countdown.
• Press Pause (or the spacebar again) to hold the current time.
• Press Reset (or the R key) to return to 100:00.
• When the timer ends, a short tone plays. Click, tap, or press any key to stop it.
• Use the sound toggle to mute the alert — your preference is remembered on this device.

Tips for accurate timing

• Keep this tab visible. Modern browsers slow down background tabs to save power, which can delay the end alert.
• On mobile, keep the screen awake or plug the device in for long sessions.
• For anything safety-critical, use your device's built-in system timer rather than a web page.

Related timers: 1 hour timer, 2 hour timer, or a 90 minute timer for a slightly shorter block.

Looking for a different duration? Browse the TimerZen home page or type any whole-number duration into the URL (for example, /45-minute-timer/, /90-second-timer/, or /2-hour-timer/).

Last reviewed on April 24, 2026.