I've only run through a single full charge cycle so far, but I charged it on 2/23 and had it finally power itself off due to a low battery on 3/9, so that was exactly 2 weeks.
Usage pattern was a couple hours a day of reading, with almost no 3G activity (only used it once to see if I could connect to B&N, didn't download anything). In between reading sessions I flick the switch in order to tell it to go into Standby.
I did not track the exact number of hours of active use vs standby, but I'll try to do that soon.
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