After the launch of watchOS 7 Beta 3, some new options "Hand Wash Reminders" appeared in the "Hand Wash" function. This feature allows users to set a location (your home), and if you do not wash your hands within a few minutes after returning from the outside, you will be notified. The user can enable it by entering the Handwashing setting in the Watch in the iPhone.
watchOS 7 introduces the hand-washing time calculation function. When you wash your hands, Apple Watch will detect that you are washing your hands, and then it will calculate the time you wash your hands, and has a countdown function. How much is 20 seconds away.