Quote:
Originally Posted by haertig
Well, Amazon really doesn't know. The best they know is what the current page is for a book you have. They still have no idea if you read the pages before the current page or just jumped to it randomly. And they don't know how many pages you have read if you keep your Kindle in Airplane Mode. That's why I said "it's inherently impossibly for them to determine that". They can collect data and store it over time - for example, they could log the current page and a timestamp every hour so they could see how fast you are progressing and make assumptions regarding reading or not reading based on that.
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I'm relatively sure the Kindle is collecting those statistics as you read and storing them in the sidecar folder. Iirc, they have a predetermined time period where a page is considered read (greater than 5 seconds at least) and I believe even an upper ceiling where it's considered abandoned/unread. Easy enough to log page turn events and increase a counter for pages read if time from last tap/swipe is between the lower and upper limits.
Yes, they won't know how many pages you've read if you permanently keep your Kindle on airplane mode (purely USB transfer only). Anytime you connect to wifi though, it's a trivial matter to upload statistics (which are just a few KB).