You must Buy Apple WatchOS 7 For Well Managing Your Hand Washing Time In COVID-19 | Protect Yourself Against Coronavirus

1.  Handwashing

Keeping your hands clean has never been more important. With watchOS 7, Apple Watch automatically detects when you begin washing and helps you keep going for the amount of time recommended by global health organizations.

Using its motion sensors and microphone, Apple Watch automatically detects handwashing and starts a 20‑second timer.
20‑second recommendation

Home reminder
Apple Watch can remind you to wash your hands when you get home.

If your watch detects that you’ve stopped washing your hands early, it will encourage you to continue for the full 20 seconds.