I had 3 interviews (each 30 mins) and one case study. The interviews were mostly about interests and experiences and that kind of stuff. The difficult portion of the process was definitely the case study. It's important to know your behavioral science to do well on this. They may ask many questions to challenge you and see how you respond. At least that was my experience. Overall, if you are passionate about behavioral science and market research and have at least some experience in either of the two, there is a good chance you'll make it through the interview process!