The process took 3 weeks. I interviewed at Google (Mountain View, CA) in May 2011
Interview
As with all candidates, I cannot go into great detail about the questions - but they mainly focus on a cultural fit. We did not discuss my background nor my resume at all, but had a series of "Brain Teasers". Google is basically Stanford Campus Part 2.
Very self-driven, first of multiple rounds, where I had to take the initiative to arrive at the problem, constraints, approach, solutions, tradeoffs and reasoning behind it in a matter of 30 minutes.
You would have to do a hiring assessment first, then a recruiter screening follows. First round interview with the hiring manager. Majorly product sense and product improvement. The questions were not direct though.
Overall a lot of steps to the interview process. Talked to different people and had opportunities to ask questions. Many different stages which made it a lengthy process overall. Wasn't too bad.