Comment by halostatue

There is a material difference between the older Apple Watch (where the charging puck uses USB A) and the newer Apple Watch and/or the Ultra (where the charging puck uses USB C). Plugged into an appropriate source, the USB C puck gets much faster charging and is usually sufficient for a day's wear after about 10 minutes (depending, of course, on what the day includes).

Charging to 80% is likely to be more than enough for most uses, and topping it up with another 15% just before bed is enough for overnight (probably).

I had the Series 4 previously and the Ultra 2 now; with the older watch, I would charge it for about an hour while watching TV in the evening. With the Ultra 2, I charge it for about 20 minutes here and there depending on what I’m doing and whether I remember. I’m currently at 39% which will be just fine for my hourlong exercise ride (with GPS), and then I can toss it on the charger while I shower and it’ll probably be at 70% which is good enough for another full day.