There is an initial 1 on 1 interview. If you get called back, you go to "super day" where there are 12 more interviewers. Sometimes you have 12 interviews, and sometimes you have 6 interviews with 2 people in each. They are behavioral evaluations. You will only get 1 or 2 technical questions.

I had an interview on my college campus with an employee then was invited to their headquarters for a 2 day long super day interview. The first evening was just a networking event with all the interviewers and interviewees. The second day I was given a schedule of who I would be meeting with and I met with about 5 different interviewers for 30 minutes each.