There was a single in-person interview. There were 4 people who interviewed me (my manager and 3 of my team members). Fairly quick interview with general questions. After the interview, one of them toured me around the factory and introduced me to the people working there.
Had an interview with several people over the course of a day. It was with the head of the department and manager of the department. Overall, it was a pretty good experience
I was brought in for a whole day interview with several people from the engineering team that I would be working with. I talked to the head of the department, the engineer project manager as well as several engineers who are currently on the team before talking to a HR representative.