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Set a timer on Apple Watch
The Timer app 
on Apple Watch can help you keep track of time. Set timers up to 24 hours.
Ask Siri. Say something like: “Set a timer for 20 minutes.”
Quickly set a timer
Open the Timer app
on your Apple Watch.Tap a timer duration to start the timer.
Scroll down to choose a recent or custom time.
When a timer goes off, you can tap Repeat to start a timer of the same duration.
Create a custom timer
Open the Timer app
on your Apple Watch.Scroll down, then tap Custom.
Tap hours, minutes, or seconds; turn the Digital Crown to adjust.
Tap Start.
Your Apple Watch displays the last several custom timers under Recents.