My wife and I both have Ones, mine is rooted and S-off etc., and hers is stock as can be. She's probably a good example of an average, every day, non power type user.
Before we got the Ones, she had a Blackberry Curve.
She gets work email on her phone, a lot of email, and mostly uses it for that and actual talking to people. She's connected to wi-fi at home, and nowhere else. As far as I know she hasn't downloaded an app, although the kids may have put some on her phone since last I looked.
My battery life is pretty good, usually 35%+ left at the end of a day (6AM to 10PM) of surfing, game playing, running apps, changing settings, messing with fonts, using widgets etc.
She gets two full days, easily - 48 hours plus, on one charge, if she needs to.
(I think users like her are part of the reason "power" users are always asking why smart phone manufacturers can't put longer lasting batteries in phones. As long as some percentage of users gets a couple of days of use, the stats can look good.)