3 separate phone interviews with 3 different executives, followed by a day of on-site interviews with all the team leaders, in multiple group interviews. When I didn't hear back I followed up. My contact apologized, saying he'd accidentally been sending emails to himself that he meant to send to me. He showed me the emails: the first said they wanted me back for a 2nd on-site interview and asked when am I available, and the second email sent a number days later (because I didn't respond) said they were no longer interested.