Using the posted word count, it’s averaging 6.7k/chapter for the explicit/adult version, or 5.6k/chapter for the cleaner version (which is also a paltry 450k/80 chapters).
Technically, its a rewrite ATM, because when I went to “restart” with a read through, it became the rewrite I’ve got going on; but filling in detail and it’s like 7x-8x the word count previously. Way more detailed, covering things that used to be waved off with a single sentence “Harry and Ron took their girls out to restaurants, but separate restaurants” has become fully involved scenes. I’ve also added in a new line of original characters (first years) that really round out what’s happening at Hogwarts during some key points; also restoring some of what was lost in a previous edit/prune.
Overall, quite pleased with the outcome.
To some degree chapter length is preference. Shorter chapters move at a faster pace, longer chapters can go deeper. My “disasterous” edit of the potter fanfic (about 15 years ago), decided it’d be GREAT to merge chapters together to make super-long chapters (some in the 70-100k range), which made individual scenes almost nothing, drowned them into a wall of text. That’s why this rewrite is undoing that change, thus I’ve got around 180 chapters where I used to have THREE.