[geek1011]

BTW, the algorithm kobo.com uses for calculating the read time range is:

HoursMax = round(WordCount / 200 / 60)
HoursMin = HoursMax - 1
if (HoursMax >= 10) {
        HoursMax += round((HoursMax + .5) / 10) - 1)
}

The word count and page number are from https://kobostats.azurewebsites.net/bookstats/{ISBN}. The word count seems to exclude front/back matter (but it includes tables and code blocks) (I'll try to figure out the details of this later), and the page count seems to have a linear relationship with the word count. Based on the data from a few hundred books, it seems to be the floor of the word count divided by 272 (this is perfect for nearly all of the books, and ~20-40 pages too large for some older ones, which makes me think they were either calculated differently at that time or manually overridden).

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The device (i.e., storeapi) seems to use the same algorithm, except that the max hour adjustment is floored instead of rounded (is this a bug?):

HoursMax = round(WordCount / 200 / 60)
HoursMin = HoursMax - 1
if (HoursMax >= 10) {
        HoursMax += floor((HoursMax + .5) / 10) - 1)
}

Also note that the on-device KEPUB word counter (i.e., HtmlUtility::countWords) counts differently than the Kobo Store.