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42mm, 14hrs 24mins standby, 2hrs 10 mins usage and I am at 50%. Very happy with that.

The watch does drain the battery on my 6+ quite a bit faster. If my phone battery is at 100% and I don't use it, it's normally around 96, 97% after 7hrs.

The same thing but with the watch I am down to the 85, 90% range.
 
Update 3: 14 hours and at 61%

Way better than what Apple has documented. I'm beginning to think that the numbers they gave were for pretty heavy usage. I haven't talked on the watch for more than a minute which could have something to do with it. I have had several text and email notifications. Along with the fitness app telling me to stand here and there. And of course checking the time.

EDIT: Just looked at the Watch app on my phone and here is what it says for time since last full charge:
Usage: 2 Hours, 38 Mins
Standby: 13 Hours, 46 Mins
 
4% left at this point right after plugging it in.
 

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I have been using the workout feature which definitely drains it faster, but not too bad. I received the watch at around 4pm with 82%. I set it up, and then I did a 40 minute walk, and by the time I went to bed at 9pm, it was at 21%. I was laying around with it a lot though.

This morning, I put it on at around 7am. I ran for 50 minutes and it was down to 62% at 1pm. I put it on the charger while I showered and It was back up to 90%. Even for a fairly active lifestyle, I think it will do fine.

Wait, just running or working out with it drains it faster?
 
I charged it before bedtime last night and left it sitting all night. In the morning it was 86%, and 17 hours later I'm at 13%. Moderate use but no workout usage.
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