There was an initial telephonic interview with the hiring manager which lasted for about 30 mins. At the end of the telephonic conversation, the hiring manager expressed his interest to meet me in person. A f2f interview was scheduled later that week. The f2f interview lasted for about 5-6 hours happening over 4 rounds. It covered mostly the basics and stuff that has been mentioned in the CV. The C interview was tricky, but nothing too difficult. No group/panel interview. Later that day, I had a chance to meet the HR person.