I find there seems to be no adaptive capability in the reading speed used. So if you read faster than the average reader, the number do not match up. Since my reading speed is considerably higher than the average English reading silently speed of ~250WPM, it's very often that I see those ridiculous numbers. The book I'm currently reading on my Sage says that I am on page 635 of 702 (synced kepub so page per screen, Adobe synthetic pages numbers says 304 pages) or 89%, I've been reading for 1hr 12 minutes and it is going to take me 45 minutes to finish the book. The book has 118K words. I tend to skip the opening blurbs and closing blurbs so my guess is closer to 10 minutes left.
The results when reading on my Paperwhite are very similar which is why I suspect Amazon and Kobo of using the average reading speed without any adaptive corrections.
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