My original handles all day just fine thanks to the not so recent software updates. If you're really worried turn on theater mode so the screen doesn't constantly turn on.
Yeah, daily is the problem. I'm tired of charging devices all the time. Phone, watch (TomTom for running), GPS (for cycling), iPod, iPad(s), laptop.
The Garmin Fenix comes really close to replacing the watch and GPS from above. And it'll run for about a week between charges. If it played music, I'd own one already (even if that meant charging twice a week).
Total 1st world problem.
Personally I'm waiting for another month or two to see if the next generation has enough to make me take the plunge.