It was 3 rounds. 1)McKinsey Solve Game 2) 2, 1-hour case and behavioral interview; First with the associate and then second with engagement manager 3) 3, 1-hour case and behavioral interview; First with engagement manager, then second with partner, and third with partner.

One round, 4 back to back interviews 50 min each - 40 min case, 10 min personal experience interview. The PEI's almost exactly match the guidelines that are given in the email sent inviting you to interview. Cases are generally math heavy, and interviewer-led. Helps to be creative and talk through your thinking process.