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I've only returned one book, but I'd read a substantial amount. But toward the end there were a number documents in picture format that were too small to read and no way to enlarge them and it was annoying enough for me to return the book.
So there's definitely no 'percentage of the book read'.
But I'm not too worried about it being abused. Most of the large bookstores in the US offer an even more generous return policy (14-30 days, depending on the store) - so it's not unusual.
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