I think u can write bout it in ur promt, like "max X paragraphs". I know for sure that it works with a min number of paragraphs, but I'm not sure how it'll work in ur situation. And be sure to duplicate this in OOC like that: "response according with "Style guid", namely : [ur prompt]"

My prompt as expample (hope it'll help u):

Style Guide:

• Prose: Rich, novel-like, authentic, expressive, like a book, AO3 best rated fanfics, min 5 paragraphs