I can get mine to last 5-6 days depending on usage. The GPS function obviously drains it faster so if I’m going on bike rides multiple days in a row it’ll be about 4 days tops, but if I do stationary bike and weight lifting it’ll get 5 days easy, even going on GPS walks it usually doesn’t drain as bad as the bike tracking.
Also worth noting I don’t have any phone notifications on my watch because I just don’t need another device getting my attention. So I think that helps to extend my battery life.
Additionally, I disabled the Pulse Ox sensor by default as that thing drains juice so fast. My girlfriend had hers on 24/7 and was getting like maybe 2 days out of a full charge.