On campus recruiting that involved one "pizza/coffee chat" that was invite only then two rounds of interviews. The first round was on campus, 30 min case and 30 min behavioral. Final round was at their office and it was a 45 min case. The final round was the day after the first round, which I preferred.

I went through two interviews. The first interview included the behavioral part and case part. The second interview was with a managing director, and the entire interview was about solving a M&A case.