There were two sets of interviews. The first was a 40 min interview the day after the career fair. The second was at the Renaissance Center in Detroit and consisted of a presentation, 1 hour panel interview and a case competition. I received a job offer within two days.
The second round interview also included a stay at the Renaissance Center Marriott (interview was the following day), a networking cocktail hour and dinner, a tour of the Renaissance Center and Tech Center, test driving 4 brand new and fully loaded GM vehicles.