Starts with a recruiter contacting you, followed by a pair of phone interviews that act as a pre-screen to see if it's worth bringing you in. After the first one, if it went well enough, you go on to a second phone interview. If all went well so far, they bring you on campus for 5 consecutive interviews, each 45 minutes with a 45 minute lunch. The lunch "meeting" is a fun time getting to know potential peers and their experiences. You get to learn and corroborate what you hear about Google. It is a great place to work and why it's in high demand. I didn't get a job offer, but was told the next step would've been to move it to a hiring committee, who acts as an unbiased neutral third party to ensure the recommendation is unbiased. They record all your answers and type a lot while you're talking and apologize in advance for doing so and inform you that it's part of the process to capture as much information to present to the hiring committee. Presumably, had I made it that far the next step would've been a job offer. The whole thing from start (the onsite interviews) to finish (a job offer is extended) would've taken a minimum of three weeks.

Four interviews broken up over 2-3 days. These include Role Related Knowledge, Googleyness & Leadership, General Cognitive Analysis, and Technical Judgement. This is about as much as I can provide on these topics.