I applied through an employee referral. The process took 3 weeks. I interviewed at Google (Mountain View, CA) in Sep 2015
Interview
The whole process was expedited as I had another offer in hand. I directly came for onsite interview, which consisted of four interviews plus lunch. The feedback for onsite interview was good but the hiring committee felt I had not been tested on some of the areas and they conducted two more phone interviews.
Interview questions [1]
Question 1
The questions were mostly about basic statistics, optimization and previous job experience.