Now more than ever, it's necessary to wash your hands frequently. And if you need a reminder, Google is here to help. The Clock application on Wear OS will now send periodic alerts reminding you to wash your hands. When you open the alarm, a timer for 40 seconds will be started along with a reminder to use soap for handwashing. When you're done, the app will let you know that another alert will come in another three hours. If you can do without the reminder, then head to its notification channel. Hold down the notification to disable it. The feature comes with v5.4.0 update of Wear OS, so check your Wear OS's Play Store to see if you have it.
Source: Android Police