Preparing the Man
Beginning with his charter flights to California, Max trained himself to stay awake for long periods of time.  He found if at the end of the long flight he alternated between a little rest, a light meal,  some exercise, and more rest; he was ready to go again within a day. If instead, he ate heavy after a long flight, it prolonged recovery or even caused sickness.  He also prepared for a long flight by losing one night's sleep a week for a month before a long flight.

Max was awake for as much as 60 hours at a time while flying. My thoughts are, how can a
human go that long without sleep?  In doing some research, I found that people have forced themselves to stay awake for considerably longer than 60 hours