The event began as twin 100-mile (40-lap) races. From 1959 to 1971, the races were counted with points towards the Grand National championship. Purses awarded were counted separately from those awarded in the Daytona 500. For 1968, the races were scheduled for each, but were cancelled due to rain, and the starting lineup for the 1968 Daytona 500 fell back on the timed laps. In 1969, the races were extended again to 125 miles (50 laps). Lengthening the races added the need for a pit stop, increasing the complexity and excitement of the races.