4 hr,
1 interviewer each for every 50min, with 10 min break between each session
4 interviewers = 2 SDE-III engineers, 2 dev-managers
50 min is divided into 45 min their interview, 5 min your questions (if any)
Interview organizer knocks door at 45 min. mark to indicate only 5 min left.
Format for 45 min: intro about interviewer (may be 2min), then your intro (be well prepared here as this will be input for interviewer focus), some design questions, and then a programming question