Should the Apple Watch be worn at all times

You have to take the Apple Watch off to charge it. Most people put the Apple Watch on after getting up in the morning, and then put the Apple Watch on the charger when they go to bed.

Most people also take off their Apple Watch when taking a shower. Also when doing some task that may damage a watch.

But unless you have a job that is dangerous to a watch, you can wear the Apple Watch all day long, every day, and just charge it at night.

There is no added value to wearing the watch all the time or wearing it only for a few hours a day. Do what fits your routine better. Just enjoy it.

You will have to take off the watch at least once each day in order to charge it. It only holds a charge for about 24 hours.

ECG is a manual procedure. You have to start the ECG app, then hold a finger from your other hand on the Digital Crown. The ECG measurement runs for 30 seconds.

So ECG is not running all the time.