I checked 30 minutes to an hour, but it really depends on the book. If I'm not that into it, I might only last about 15 minutes. If I can't put it down I have stayed up, over night (meaning a good 5 or 6 hours), although anything over 4 hours usually means I'll suffer for it the next day. I have yet to try any serious night time reading w/ my Kindle, however, so those figures may change.
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