I've been unplugged now for 10.5 hours, and my battery is at 51%. I've been in WiFi for all but about an hour of that, though. Other than that, I'd say it's been moderate usage throughout the day. Checking emails, facebook, plenty of texting, surfed the web for awhile, watched a thunderbolt review video when I was bored, downloaded a handful of apps, checked my RSS feed and bank accounts...
I can live with this, easily. On the rare occasion where I don't have access to a charger for a day or so and I'm in 4G all day, I'll just turn all syncing off. I bought an extra USB/microUSB cable from monoprice yesterday to take to work, but I don't even think I'll need it.
I'm going to leave it unplugged and see if I can make it through the afternoon and the gym tonight.