Turning this on asks your browser for permission once.
Paste that anywhere HTML is allowed. Free to use, no attribution required.
The countdown is anchored to a finish time, so it stays exact even if the tab is in the background. Press Test sound once so the browser lets audio play. Space starts and pauses, L takes a lap, R resets.
Two hours covers a film, a long exam, a slow roast, or a parking session. It is long enough that you will almost certainly be doing something else when it ends.
Switch on the browser notification in the settings panel for a countdown this long, so the alert reaches you even if this tab is buried behind others.
A free online timer, stopwatch and countdown clock that runs entirely in your browser. No account, nothing to install.
It keeps working offline once loaded, and you can add it to your home screen like an app. Your settings stay in your own browser.
Press Voice control and allow microphone access, then speak normally. Your speech is handled by your browser's own speech service, and nothing is stored by this page. Allow the microphone once and switch this on once, and it stays on as you move around the whole site, in this tab or a new one. It switches itself off after an hour of not being used. The button always shows whether it is listening, and tapping it stops it for good.
One hundred and twenty minutes, seven thousand two hundred seconds.
Switch on the browser notification in the settings panel. Over two hours you will almost certainly be in another tab or another app, and a notification reaches you where sound alone might not.
For a couple of hours, yes, as long as the tab stays open. For anything you cannot afford to miss, or anything days away, use the countdown to a date page or your phone's own alarm.