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Reading time is determined by average pages/minute and number of pages left, scaled in some manner to account for changing font sizes. Since you had to redownload, I assume you lost your place in the book and had to skip back to it. That probably involved multiple rapid page turns to narrow it down to the exact page you were on, which can skew the average pages/minute number. It should even itself out as you continue to read at your normal pace.
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