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I believe an average days use is 2 hours so 20 hours of reading is the equivalent of 10 days of use which sounds low too me given how you said you are using it.
What really matters is the number of page turns. E-ink readers use power when they turn the page. If you are reading 3 books in 5 days then you are probably turning the page pretty frequently which is using the battery. 5 days sounds low to me, I am guessing that is about 1,500 page turns. I would call Customer Support and ask them.
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