8 Hour Timer

About this eight hour timer

This eight-hour countdown runs entirely in your browser. A long-duration timer for extended sessions where you want a single end signal. There is nothing to install, nothing to sign up for, and no data is uploaded when you start, pause, or reset.

A eight-hour timer is a long stretch — use it when you want a single end signal far in the future rather than a series of shorter intervals. It works for extended study sessions, long meditation sits, slow-cooked recipes that do not need an intermediate check, or simply marking when a specific time will have passed.

Long timers are more exposed to browser background throttling and accidental tab closures, so keep the page in the foreground where possible. For anything time-critical or safety-related, use a dedicated kitchen, phone, or system timer instead.

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 8:00.
• 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: 2 hour timer or 30 minute timer.

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.