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I would imagine that the time to read in chapter depends on a conforming (to amazon standards) and working TOC in the file. I see some books that only have cover, beginning, and end in the TOC that you can access in the goto section of the kindle. Don't have a PW yet to corrolate a missing external TOC and or hyperlinked inside book TOC with the missing time to read in chapter feature. I strongly suspect though that it needs both: hyperlinked TOC and "external" TOC.
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