I applied through my school's on campus recruiting process in early October and was invited to the first round in mid-October, which was held in the BCG office closest to my campus. My final round was a week later in the office I had preferenced in my application. As one might expect, the cases were the most difficult part, but I was able to keep a calm and friendly demeanor throughout, which helped me.

Multiple rounds with consulting case interview portions and fit portions. Each round of interviews had multiple interviews, and the interviewer gets more senior as you progress through the interview process