So I drank too much and didn't charge my watch last night.
When I put it on to go to work it was at 18%.. so I charged for less than 15 minutes. Enough time for me to brush my teeth, feed the cat and get my bicycle ready. When I put it on it was at 33% and it lasted all day! It went into power reserve mode right as left work. I sent one text to my girlfriend stating that I was leaving and the next time I looked at it it had died.
It gave me the 10% warning around 4:30 I think but I declined to put into power reserve and went along like usual.
Pretty impressed! I have the majority of notifications turned off so I only get fitness alerts, texts and important emails from Inbox, so I'm probably on the lighter side of battery usage. I also did not run the workout mode on my commute to work, that was the only behavioral change I made. I have the 32mm fwiw.
Anyway, thought I'd share. Its actually the first time I've had it powerdown. I think it would actually be viable to wear it nearly all the time (basically while you sleep) and just charge it while you shower or are doing the dishes, etc. You'd never get it to 100% but if you sip for a few minutes once or twice a day I think you'd make it. I might try that out.