Set the timer to 21 hours

How to use the online timer

Bread dough that needs an overnight prove often calls for 21 hours in a cool spot, and a timer takes the guesswork out of when it's ready to shape. Set it once you've covered the bowl, check the dough near the end rather than constantly, and trust the number over how it looks late at night. Good bread rewards the kind of patience a clock keeps better than you do.

Hit Start whenever you're ready and the timer runs on its own from there, no further clicking required until it finishes. It only counts while the tab stays open, so leave it running in the background rather than closing the browser or navigating away if you need the time to stay accurate. Once it reaches zero, an alarm sound lets you know without you having to keep checking the page.

A phone timer works fine until a call comes in or a notification steals the screen at the worst moment. Running it in a browser tab keeps it separate from all that, ticking away quietly in the background of your computer or phone without competing for attention until it's done. There's nothing to install and nothing to sign up for, just a page that does one job well. Set a timer for 21 hours, set the timer to 21 hours, start a 21 hours timer — it is the same countdown either way.