It seems each hiring manager conducts their hiring independently, so my guess is that each manager is different and each interview is different.

I started with an allotted one-hour interview with the hiring manager, but he didn't seem to come to the interview with any questions. We chatted for a short while about my resume, and then I asked him some questions. We broke early.

They then gave me a take-home test which took several hours. I sent it back; they said they were happy with it and asked to schedule a more rigorous technical interview.

Then they went radio silent for a few days and rescinded the offer, saying the spot was filled.