My books blow the bottom of the chapter length currently. My last book 108k words has 90 chapters.
But I have been considering changing that. In my stories there are two times I cut a chapter break in:
First - a scene. By a scene, I am thinking of a play. So the actors walk into a room, do some action and leave that room. Chapter break. This yields chapters of like 1500 words.
Second main character change. I.E. the story is following the great detective GMW as he tries to solve the case of the lollypop bandit. The story opens with GMW running for his life from a pack of raving mad babies who want to know why the case is not solved yet. Eventually the POV changes to the bad guy and his horde of lollypops and we learn of his master plan to rule the world by creating an enraged army of babies! Chapter break would happen when the POV moved from GMW to the bad guy.
Currently I use BOTH to break a chapter. If I were to only use the second, and use the first as sub chapters, I would end up with like 1/3rd the number of chapters, maybe less.
Might change it in book five and see if my fans revolt or party.