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And whats the diff with Page Turns vs Hours ? (A device could be on for hours and have an unrelated number of turns, right?)
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Correct. E-ink devices like the Sony only use power to re-draw the page while the jetBook needs power all the time to light the TFT screen thus its really hard to compare the two.
Using your numbers... assuming you take 2 minutes to read a page and you have 24 hours of battery that would put you at around 720 'page turns' per charge. My personal experience is I eventually need to sleep even on days of marathon reading so plugging in my jetBook isn't an issue (and it is worth it to me for the trade off in faster response time, lack of refresh 'flash', and lower price.) You can also continue to read the jetBook original while you have it plugged in to either the wall socket or a computer USB.
Don't forget that DRM support for the jetBook Lite is limited at this point and non-existent in the original JB if you plan to buy lots of new releases.