Depends on a lot of factors of course, but I'm making it through 12 - 18 hours with moderate usage, a full day easily, with lighter usage. It's always going to be lower in the beginning due to the battery not being conditioned/cycled properly, and also due to the user playing with the device a lot more, as a novelty rather than the device seeing normal use.
I just got 124 hours on my TP2 before it conked out, with light use (~1 hour) though, to put it into perspective lol. That's over 5 days haha, WinMo ftw. But 12 hours+ is generally enough for me with moderate use, and 1 - 2 days standby is fantastic considering I have BBC News app, Facebook push, Weather Channel app, 3 UK apps etc all updating in the background, and 4 email accounts being checked every 30 minutes to 1 hour. WinMo on the other hand, only had the email.
Oh, and my network is 3G only, so no option to fallback to 2G, and also a weak signal in a lot of places (the beauty of a young 1800Mhz only network lol).