CHYOA Forum

23123 stories (88%) have at most 24 chapters, 9299 (36%) have at most 4. The mean is 44.3 chapters per story, but the median has to be much lower. Guessing 10, maybe?

On the other extreme: the top 10 stories (not the 10 biggest!) together have 2.4% of all chapters on the site. The Rulebook has 0.54% all on its own.

I had to double check, because that sounds absolutely crazy, but yeah, you are correct

It gets even more insane when you realize that over 1% of all chapters have been written by the same guy.(Wicker)

It does sound a little crazy, but when you think about it, it makes sense.
Popular stories with no real premise tend to make use of CHYOA's braching system to the fullest, and so end with an insane amount of chapters.
On the other hand, you have a thousand stories that simply never evolved past the first 5-10 chapters, or have 5000 words per chapter, or are simply just short stories with short reads.