But help me out with the size of the roster. Say you have 25 people needed to operate 25 stations. 3 shifts so you have 75 people on your ship.
Then you go to 4 shifts without stopping at a start base to pick up extra 25 people. And you have to put 1/3 of your crew in double shifts, or you spread it out so everyone picks up an extra shift 1/3 of the time. And in average everyone works as much as before.