[tzs]

I use my Series 4 for sleep tracking.

I normally have it in Theater Mode so that the display is off except when I explicitly touch it or press a button [1]. That saves a lot of power.

In the evening when I've finished dinner and sit down on the couch to do the NYT crossword puzzle, read a while, and maybe watch a little TV I put the watch on the charger which is next to the couch. It is usually in the 35-50% range when it goes onto the charger.

Sometime in the next hour or so I'll notice that it has finished charging and put it back on.

[1] There is a setting for that somewhere in the settings, but it is faster to just swipe up and tap the Theater Mode icon. That also turns on silent notifications, but the icon for that is right next to Theater Mode, so another tap on the same screen undoes that, leaving it just in Theater Mode.