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If you are talking about continuous reading with the "day and a half" then that's relatively normal; The estimate given by Amazon assumes that you are reading about half a hour daily -- not continuously for a month straight.
If you just got a new Paperwhite 2013 and decided to transfer all your old books, which seems more likely, it is almost definitely the indexing of all books (i.e. making them quicker searchable etc.).
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