I recently got an Apple Watch series 3 (non-cellular) and I can use it for three days before needing to charge it. It’s my understanding that this wasn’t the case with the previous versions, the series 3 battey life has been drastically improved.
My series 2 lasts two days. It'd be nice if it lasted three so I wouldn't have to take my charger with me on weekends away, but I haven't found it to be much of a pain either.