Thread: Firmware 4.32.19501
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Old 04-17-2022, 09:02 PM   #149
davidfor
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Posts: 24,905
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Join Date: Jul 2011
Location: Sydney, Australia
Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos
Quote:
Originally Posted by geek1011 View Post
BTW, the algorithm kobo.com uses for calculating the read time range is:

Code:
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).

___

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?):

Code:
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.
I haven't hunted around for that sort of thing. I'm interested that they are calculating the time read on the fly in the store. Are you sure about the words per page? They used 320 when they had the full-book page numbering.
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