I have read about 5-6 hours per day, wifi/3g on, depending on location, screen brightness half time at 12 (when home) at 20+ when not... been charging every second day. Granted, it was rarely completely drained... so, I would guess, I am getting about 14-15 hours. I posted about it in another thread, but this is after two extra days of observations.
On the other side, I played around with it and it seems wifi/3g really make the difference - more so than turning the screen on/off.
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