Drivers of prototype cars will drive between 2-4 hours depending on the schedule for that weekend's race. They cannot drink any fluids while they are driving. They refuel, but only as
much as is absolutely necessary to keep them from running out of fuel before their next pit stop.
GT drivers may drink fluids during the race, and can go through two or three sets of tires over the course of a four-hour race. The total number of pit stops per car is usually just one, but
A driver may have to pit twice if he runs through two sets of tires during the first stop.