Totally depends on usage.
I’ve had every watch except the 5, and even disabling background refresh and AOD and setting brightness to low, I definitely cannot get more than 24 hr ever.
I have only ever had the GPS model and I track my exercise with an average of 15 minutes daily.
I have to speed charge my watch at bed time with the new Apple fast charger and sometimes fall asleep before it’s topped off and ready to track my sleep.
Point being, the battery life is not adequate at all for me since the series 6 and I’m not a “power user” by any stretch.