6 small interviews. It was an all-day event that started off with a presentation by HR and some of the engineers, a little bit about the company, then we got to tour the plant. After the tour we were sent off to do interviews, basically, I had roughly a 25-minute interview with one person, then once time was up I was sent to the next room with a different interviewer and so on and so forth.

Round-robin style interviewing with many different managers over the course of 1+ hours with a lunch break included in the middle. You also had the chance to speak with former co-ops and ask questions.