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Each 10 minutes in the cover gives you an hour of reading time. So they told some of the reviewers and it seems to match my use.
Now if you have reading sessions of 7 hours with no breaks, no eating, no bathroom, never putting down the reader for even a minute, it might be an issue. But I read for hours each day, but still have to do this and that in between, even if its just 5 minutes. I put it in the cover for that and then continue reading. I never run out, no matter how long I read.
Or one could then stick it in the cover and read with it on. I don't like reading with the cover on so I don't.
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