6 (or more) 30-minute interviews plus a 40 minute presentation and 20 minute Q&A, followed by more interviews, some with the same people. The process took a month or two. I was interviewing with a number of companies and none were as rigorous as this one. After many hours of interviewing and many more hours putting together the presentation, I received a standard canned rejection. When I asked for feedback I was told they were not able to provide any- it seemed like they were afraid of getting sued. Really left a bad taste.