One 40-minute interview.
I applied through foobar, so I only had to do one, but normally there are two.
After that, you go to the hiring committee, who makes the final decision.
I can't say since I'm not allowed, but it wasn't too difficult. Most of it was about asking questions and clarifying before answering them.
The following metrics were computed from 123 interview experiences for the Google Software Engineering role in United States.
Google's interview process for their Software Engineering roles in the United States is very selective, failing most engineers who go through it.
Candidates reported having very good feelings for Google's Software Engineering interview process in United States.