We had an information session at my university, at the end of which anyone interested in the position handed in their resumes. Received an e-mail around 10 pm that night for an interview the next morning. The on-campus interview was scheduled for thirty minutes, however, I was only asked questions for about 10 minutes, and the rest of the time I asked questions. Still waiting to hear back about the on-site interview.

Started with ~30 minutes of phone interview, usually followed by an on-site interview. There was one interviewer (a hiring manager) speaking with me on the phone. I was not offered an on-site interview though.