If I had a dollar every time someone answered, "How long should a case study be?" with "It depends," I could probably afford to buy eggs. Probably. Putting aside the salty vibes, let’s skip past the vagueness and get straight to a clearer answer. Your case study needs to be as long as it takes to tell the story clearly—and not one sentence more. But since some may still find that response to be annoyingly vague, here’s a practical breakdown that might help you decide.