Overall a fairly strenuous interview process - likely because you know you're interviewing at Google. Preparation for the initial phone interview is key to making it onsite. The onsite interview lasted all day and interviewed with 5 different people. Each asked similar questions but each also had their own unique questions depending on their role. The key is preparing well, confident with your answers but not rehearsed. And don't wear a suit - you'd be really out of place. I wore a shirt, slacks, and tie and that was plenty. The interviews went very well. I was narrowed to the final 5 people and I didn't get selected.