Is this timer fixed at 5 hours?

It opens set to 5 hours, but you can adjust it in 15-minute steps from 30 minutes up to 12 hours, or pick one of the presets below the timer.

What are the presets for?

They jump the timer straight to a common length: a 5 hour sous-vide cook, an 8 hour shift, a 3 hour exam block, or a 6 hour road trip leg.

Will it make a sound when time is up?

Yes, it plays a short beep through the Web Audio API and flashes the screen. Make sure your device volume is on to hear it.

Can I change the duration while it is running?

No. Pause or reset the timer first, then adjust the duration or pick a different preset before starting again.

How do I show it full-screen?

Click "Fullscreen" for a large display that works well projected on a wall or shared in a video call. Click "Exit Fullscreen" or press Esc to return to normal view.

Does the timer stay accurate if I switch tabs?

It keeps counting in the background, but some browsers throttle inactive tabs, so the alert can land a few seconds late over a long duration. Keep the tab open and active for the most precise timing.

Does this send any data to a server?

No. The countdown runs entirely in your browser. Nothing about your session is collected or transmitted.

5 Hour Timer

Name: 5 Hour Timer
Availability: InStock
Author: Nham Vu

Start a 5 hour countdown, nudge it up or down in 15-minute steps, or jump straight to a preset for shifts, exams, road trips, or sous-vide cooking.

5 Hour Countdown

5h 00m

5:00:00

Presets

Summary

Start a 5 hour countdown, nudge it up or down in 15-minute steps, or jump straight to a preset for shifts, exams, road trips, or sous-vide cooking.

How it works

The timer opens set to 5 hours. Use the + and − buttons to adjust it in 15-minute steps, or pick a preset below.
Click "Start" to begin the countdown.
Click "Fullscreen" to show a large countdown on a shared screen or projector.
Hear a beep and see the screen flash when the timer reaches zero.
Click "Pause" to stop the countdown and click again to resume from where you left off.
Click "Reset" to return to the currently selected duration.

Use cases

Time a 5 hour sous-vide cook and get an alert when the water bath is done.
Cap a long work shift and know exactly when to clock out.
Time a 3 hour exam block using the exam preset.
Break up a road trip into driving legs with the road-trip preset.
Bound a long study session or open-book take-home test.
Time a slow braise, roast, or smoker session that runs several hours.
Cue a scene change or intermission during a long stream or event.
Limit screen time or a gaming session to a set number of hours.

Frequently Asked Questions

Last updated: 2026-07-21 · Reviewed by Nham Vu