The interview was with two managing consultants. They were both very friendly. It was 30 minutes of background questions and 30 minutes of a case study. We ended up chatting for longer than 30 minutes, so my case study was rushed a made a simple mistake at the end, and wasn't called back for the second interview.

They emailed me asking for a 1st round interview. Nothing out of the ordinary, went through some basic questions and a quick brain teaser at the end. The second round was a case-study, lasts a little under an hour.