lcloo
Captain
For a 12 hour flight mission, I think 3 crews would be preferred, with each crew work for a four hour shift. 2 crews are also possible but they will have heavier workload and may get fatigue and risk making errors.
If one crew consist of 12 members, that would be 36 persons (3 crew) on the flight.
If one crew consist of 12 members, that would be 36 persons (3 crew) on the flight.