Mrh? If the turns were 00/06/12/18, you could do a turn at 00:30, sleep until 11:30, then do the 06 and 12 turns in an hour, go back to sleep until 23:30, do two more turns in an hour, etc.... You could sleep 22 hours a day, and two turns in each of your waking two waking hours.
It would be hell for Marshals. 
You would definitely have to have a pretty large military committee to handle orders.
Ah, yes that is true, I am used to being on at the end of a turn and the beginning which is why I was thinking what I said but you are completely right.
