Among the enhancements made to the IMSA Prototype Challenge schedule is the evolution of the endurance racing format that debuted in 2018. One year after shifting from two 45-minute sprint races per weekend to a single one-hour, 45-minute endurance race, the series will extend to a three-hour race format for select events in 2019.
The six-race schedule will feature three-hour endurance races at Daytona International Speedway in early January – run during the Roar Before the Rolex 24 weekend – and Canadian Tire Motorsport Park. The three-hour races will have a minimum of two drivers per car and a maximum of three. All other events will remain one-hour, 45 minutes in length.