The 24 Hours of Daytona, also known as the Rolex 24 At Daytona for sponsorship reasons, is a 24-hour sports car endurance race held annually at Daytona International Speedway in Daytona Beach, Florida. It is run on the Sports Car Course layout, a 3.56-mile (5.73 km) combined road course, utilizing portions of the tri-oval and an infield road course. Since its inception, it has been held on the last weekend of January or first weekend of February as part of Speedweeks, and it is the first major automobile race of the year in North America. The race is sanctioned by IMSA and is the first race of the season for the IMSA SportsCar Championship.