I had 6 interviews, 5 during the first day and then a last one called "as appropriate". The last one means you basically passed the interview process and get a chance to get to know the GM of the unit to ask some though questions (both ways). The questions during the interview ranged from behavioral skills to technical details. It wasn't uncommon to talk about past experiences and challenges, reasons to join the group, design scenarios and coding challenges. Overall I felt the interview very professional and timely.