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 that uses most of the tri-oval plus an infield road course. Held on the last weekend of January or first weekend of February as part of Speedweeks 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.