After putting my watch on at around 6:45am, logging a workout of 30 - 45 mins, and taking my watch off around 9pm, I’m usually still at 50-55% on my 44mm Series 5. And I’ve had it exactly one year today, so the battery has sone wear and AoD is left on always. I am impressed with how good the battery life is. It’s 2 days still.
That was one of my Contingencies in order for me to upgrade was the battery life had to be improved, there was quite a few reports with the S5 struggling with the battery duration with AOD. I know it has a larger battery this year, probably to help offset some of the new health Sensors, but more importantly, more stabilized battery life. And as you mentioned in another post above, I think the S7 will be a huge year for the Apple Watch with new hardware, possibly even introducing micro LED displays.