YMMV based on amount of notifications/calls, but I'm getting around 36 hours on the G Watch. Obviously it isn't what you'd call pretty, but looks like with the R they're making progress toward a proper watch design. Maybe next year they'll have full screens that look like the Withings one...
That's about the same as I would get on the Gear Live if I skipped charging it for a night. On a normal day, I take it off the charger around 8:00 or 8:30, and I'm usually going to bed around 2:00 with 45-ish percent left.
