I had 3 thirty minute interviews and 1 forty-five minute interview on one day. They also had presentations to introduce you to the program, the current graduate students, and the faculty at Harvard. Most of them were more informal than interviews I have had at other graduate schools. They were very open to answering my questions about the BBS program and Harvard in general. There was also two faculty dinners. One with everyone in the Prudential Center the night after interviews. The second one is at a faculty members house with a small group of fellow students interviewing for the same program. Harvard's overall pitch was that we are Harvard and this is the best place for you to be trained. They also made a major effort to assure recruits about how Harvard's negative work environment and poor collaboration reputation is not universal across all labs at Harvard. I estimate that there were 60+ people interviewing for the same program, the same weekend as me and there was one later interview weekend with supposedly the same number of people interviewing. Overall, the weekend was very professional and organized. The faculty appeared to be very genuine and candid about their interest in graduate students and were very honest in sharing their perspectives of Harvard. They did a very good job at recruiting you to Harvard.