Long. Had several phases (~2 phone calls, ~3 onsite interviews), when 2 at most was necessary. Had another employee interview me, along with a manager (separately). The employee probably should have been supervised in the interview with someone with more interviewing experience, like a manager. When interviewing the the manager, I was penalized for using different terminology than they preferred (I used synonyms that were industry-acceptable) and by not approaching processes in the EXACT way that the manager would (so I couldn't read their mind, but maybe they weren't open to different perspectives).

I don't think they continue following these guidelines, but I was interviewed through Michigan Works. There was a video interview (pre-recorded questions), a phone interview with a QA manager, and a 1:1 interview with a HR person.