IIRC, Calibre splits pages after 260KB of text. That's a lot of text for one chapter already.
But yes, this sort of stuff is the reason why the Kindle messes up sometimes. You're reading, and it says "50 minutes to end of chapter", then read, suddenly it jumps from "1 minute to end of chapter" back to "10 minutes to end of chapter" (while you're still in the same chapter). Stuff such as maps and short intro's and such sometimes *really* messes it up.
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