How do I use this 8 hour timer?

This page is preset to 8 hours. Use Label and Sound on the widget to pick a sound and message, then click "Start timer". Keep the tab open — the alarm sounds when time is up.

Will the timer work if I close the tab? Why didn't it go off?

The countdown only runs while the page is open. Closing the tab or putting the device to sleep stops the timer. Keep the page visible and check your volume. On mobile, keep the page in the foreground.

Can I use a different sound or message for my 8 hour timer?

Yes. Use Label and Sound on the widget to add a message and pick a ringtone. Settings save when you start the timer.

Are my timer settings saved? Can I bookmark a timer?

Sound and message save per duration. Last-used timers appear in "Saved timers". Each timer page has its own URL — bookmark it and settings load with one click. Open different durations in separate tabs for multiple timers.

Set timer for 8 hours

Label

Set a timer for 8 hours in your browser — no app or download needed.

Works on desktop and mobile.

Your latest online timers

When you set and start a timer, its settings (message, sound) for that duration are saved automatically. Your saved timers appear here. Click one to activate it with one click.

About the 8 hour timer

Timer preset to 8 hours. Pause, resume, or reset at any time. Keep the tab open until the alarm rings. Hit "Start timer" to begin the countdown. Use an 8 hour timer for sleep, long work sessions, or reminders later in the day. When the countdown reaches zero, the alarm sounds. Use Label and Sound on the widget to change the alarm sound and message. Keep the page open until the timer rings.

How to set a timer for 8 hours

This page is preset to 8 hours. Start the countdown:

Confirm the duration is 8 hours (or change it if needed).
Optionally use the Label and Sound rows on the widget to add a message and choose a ringtone.
Click "Start timer" to begin the countdown. The widget shows the remaining time.
Keep the browser tab open until the timer reaches zero and the alarm rings. You can pause, resume, or reset the timer.
Use the toolbar (top right) to zoom in or out or switch to fullscreen.

Set timer for 8 hours – Free Online Countdown Timer

Use this page as an 8 hour timer to wake up or set a reminder 8 hours from now. Use it for long study sessions, work blocks, meetings, cooking, sleep, or extended countdowns. Alarm settings are saved for future use.

Related time tools

Need to wake up at a specific time? Use the Online Alarm Clock. Want focused work sessions with automatic breaks? Try the Pomodoro Timer. Track elapsed time with the Online Stopwatch. Count items with the Online Counter. Check the time with the Online Clock.

Frequently asked questions

How do I use this 8 hour timer?: This page is preset to 8 hours. Use Label and Sound on the widget to pick a sound and message, then click "Start timer". Keep the tab open — the alarm sounds when time is up.
Will the timer work if I close the tab? Why didn't it go off?: The countdown only runs while the page is open. Closing the tab or putting the device to sleep stops the timer. Keep the page visible and check your volume. On mobile, keep the page in the foreground.
Can I use a different sound or message for my 8 hour timer?: Yes. Use Label and Sound on the widget to add a message and pick a ringtone. Settings save when you start the timer.
Are my timer settings saved? Can I bookmark a timer?: Sound and message save per duration. Last-used timers appear in "Saved timers". Each timer page has its own URL — bookmark it and settings load with one click. Open different durations in separate tabs for multiple timers.