The process took roughly 4 months end to end. A friend recommended me internally for a role which I got through to an interview. The first round was a phone interview with some basic questions why do you want to work here etc. After this had a second phone interview and was invited to a 4 hour on site interview day. When I got to the Google office I was told that the role had been changed to something completely different and that the hiring manager did this because he felt too many people applied for the role I applied for. After a discussion with him he made it clear that it was not a test and that the role had been changed to something I couldn't do and therefore probably wouldn't get the job. He then gave me the option to continue with the interviews but it would only be to get to know the company a bit better...