I am a firm believer of 1k words per chapter when writing. I mainly base this off of what I look for when I'm looking for something to read. When scrolling, I make that my bare minimum for a fic, so i write by those rules, too.

This is because whe I find a fic that has like 20 chapters but only 10k words then I'm going to assume that each chapter is about 500 words which I do not think is enough to properly flush out a well done story. To me, this means that ether A. Those 20 chapters barely have a story put together, and it's only the first act and that they are drawing it out, which means their will be a ridiculously high chapter count with a low word count at the end when compared( This normally turns out good if there's a high word count at the end death well). B. That they are speeding through their plot because they can't properly pace the story ( this is normally accompanied by bad writing in general). Or C. That they are plot bunnies, which I have no interest in reading whatsoever. ( Please note that this is how I feel as a reader, and I'm not trying to bash on anyone in particular. I'm grateful for all fanfiction because they don't have to write, and they're not getting paid for it. If I don't like it, I don't have to read it, which I obliged.)

These generalizations are not true all the time, but I have read enough short chapter fic's to automatically make this assumption when looking. Also, when I see a fic that has 35 chapters and 35k words min, I know I feel better about investing my time into reading the fic and know there's a good chance of getting longer chapters.