My interview lasted one day only (a morning to be exact) and it consisted of a personal interview about my resume that was followed by a one-on-one case study interview. The case study interview was very similar to that included in the emailed packet (you'll get a packet to prepare you for the case study interview). The interviewers were nice, I think I did ok on the personal portion but struggled to do the quantitative reasoning on the case study part since I didn't have a calculator and I'm not a business student.