depends on how much time he has
if he travels against the rotation of the earth, he has more time
the answer would be number of stops/time (minutes)
number of stops=91.8million
if we were to assume he did it at night (from 6 to 6) disregarding complecations like roration and bathroom breaks, 12 hours=720 minues
91.8million/720=127500 stops per minute