2 coding tests, 1 behavioural interview and 1 product design interview all on one day back to back, about 3 hours total. I was given an overwhelming amount of information and materials to study in the 4 weeks leading up to the interview. In the end it was a no but the reason given was that the way I have work assigned to me in my current job was not the same as how they work at Facebook. I wish they would have said that up front because I spent a huge amount of time preparing for the interviews.

The interview took me 2 months. I tried to choose more distant dates so that I could prepare better. 1 screening with 2 medium leetcode algorithms, then 2 days of full loop: 2 algorithms + system design and 2 algorithms + behavioural. + there was online coding challenge with web camera without an interviewer splitted into 4 stages and lasted 90 minutes.