It’s really 2.5 days with regular use honestly. Anyone seeing only 1 day is using GPS and cellular a ton. I find the battery life to be more than adequate.
Anyone actually using it won't even see full day battery life. If you use it just as an expensive clock with every feature disabled, sure it may last longer but then you'd be better off buying an actual watch that lasts for months or years without a battery replacement. I rarely use cell, GPS for a hour+ for my exercise at most, some timers, notifications, reminders, shopping list etc. and just that light use drains the battery in 6-8 hours. Play some music and you're down to max 4 hour battery life. It does charge pretty quickly but it's still so underwhelming compared to my expectations. Won't be buying a new model until they at least double the current battery life.