The thing is, it depends. It depends on where the natural breaking point is. If we think of a chapter as a sort of mini-book we won't have to worry about things like length. How do we do that? Make sure it has a
- beginning (problem/point of change)
- middle (rising action/conflict)
- end (resolution/action to address the conflict)
Let's use an example. Because I know you love those. Plus I have to bring in the "paranormal" somewhere, right? Let's go with our ghost example from my filtering through character post. Remember? Ghost is haunting her ex-boyfriend (Erik) who is taking another girl to prom. In our fake chapter let's have our ghost try to ruin the evening by messing with the prom date (Heather) at dinner...
- Beginning: We start with the problem. Jealousy. Q: what's the first thing your character thinks or notices? A: The way Erik's hand rests on the small of Heather's back
- Middle: This is where the meat of the action/conflict takes place Q: What would my MC do to solve the problem? A: Manipulate objects like food and drink spilling on Heather to make her look bad. Tripping her. Maybe even pushing her at the last second so she bumps heads with Erik when he goes to kiss her
- End: Resolution. Q: What happens as a result of the MC's actions? A: Erik feels bad for Heather when she starts to cry, and tells her she looks good with spaghetti in her hair. Maybe he puts some on his own head to make her laugh and holds her head steady so he can carefully plant a kiss...
That works out well, no? A kiss after all that is a nice page turn. How long is this chapter? No idea. Probably pretty short (though honestly for me that's typical) but it really doesn't matter. What matters is it's a complete unit that's furthered both the overarching plot and character development. It has to be satisfying, yet make you want to keep reading. Piece of cake, right?