I use mine almost every day. And usually for a good 30 minutes to an hour, sometimes more. And, with wifi turned on, I'm still only charging MAYBE once a month. I've never really sat down and tried to keep a log of how much time I'm actually reading, though, so I can't give you any real HARD numbers.
I have the Keyboard model, not the new non-touch model, so YMMV.
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