Two phone interviews back-to-back, each for 45 minutes.
There is usually one behavioral question at the beginning about your previous project(s).
The coding questions in the first interview are usually easier than those in the second one.
Both interviews, though, are not too hard as long as you have practiced. Staying calm and performing your best are the hard parts.
Many of the interview questions can be found on websites like LeetCode, HackerRank, etc. From my experience, the specific questions don't matter too much. What matters is that you practice solving and coding problems as often as possible (ideally daily) to get comfortable with it.
The following metrics were computed from 3,728 interview experiences for the Google Software Engineer role in United States.
Google's interview process for their Software Engineer roles in the United States is extremely selective, failing the vast majority of engineers.
Candidates reported having very good feelings for Google's Software Engineer interview process in United States.