If we're talking about books it depends on the story being told, genre and just general length of what a chapter is. For literary fiction the chapters tend to reach about mid 20s, some single fantasy or sci-fi can reach as little as 19 and as big as 60, mystery tends to have high chapter counts like 30s to 40s but the chapters themselves are short to be punchy and keep both you and characters on your toes. Horror tends to be shorter as you can only keep dread and tension for so long. And I say romance is roughly the same as mystery, short chapters but mid-high count.
And these are just novels not novelettes and I'm thinking more on older (pre 2012) adult books, there's different lengths depending on demographics like YA, New Adult, and Children's. And some people just do large parts not broken by chapters or a single book with multiple parts separated by chapters within them. Overall a chapter needs to end both to close a scene, idea, arc, conflict or be a start, it's not a goal post to say if your story is complete or not it's just a matter of giving the characters and the reader a break.