The format is simple: a fixed duration (most commonly 6h, 12h, or 24h) rather than a fixed distance. Teams run multiple drivers — typically two or three, occasionally four — in rotating stints, each stint governed by minimum and maximum duration rules. The fastest car at the end of the clock wins, not the fastest car at the end of a lap count.
This inversion changes everything. Pit strategy, traffic management through multi-class fields, night driving, fuel save windows, and the decision to push hard versus nurse the machinery all carry equal or greater weight than raw speed. A team that blows a gearbox at hour 22 loses the same as a team that crashes at hour 1.
[[24-hours-of-le-mans|24 Hours of Le Mans]] — the oldest and most prestigious, first run in 1923, held annually on the Circuit de la Sarthe near Le Mans, France. The traditional home of prototype-versus-GT class battles and the anchor event of the WEC.
[[24-hours-of-daytona|Rolex 24 at Daytona]] — the season opener for [[imsa-weathertech-sportscar-championship|IMSA]], run at [[daytona-international-speedway|Daytona International Speedway]] every January. Uses the tri-oval combined with an infield road course.
[[24-hours-of-spa|Spa 24 Hours]] — the Belgian GT endurance classic on Circuit de Spa-Francorchamps, the primary showcase for the Intercontinental GT Challenge and GT World Challenge.
[[24-hours-of-nurburgring|Nürburgring 24 Hours]] — the most brutal event in motorsport by attrition rate, run across the 25-kilometre Nordschleife plus the GP circuit, with upwards of 200 cars in a single field including full GT factory programmes down to street-legal production cars in the lowest classes.
12 Hours of Sebring — the oldest road course race in the United States, run at Sebring International Raceway each March alongside Daytona as the IMSA bookend.
The [[fia-world-endurance-championship|FIA World Endurance Championship]] is the global top tier, jointly sanctioned by the FIA and ACO, running Hypercar and LMGT3 categories across rounds in Europe, the Americas, Asia, and the Middle East with Le Mans as its centrepiece.
The [[imsa-weathertech-sportscar-championship|IMSA WeatherTech SportsCar Championship]] is the North American counterpart, operating GTP (prototype), GTD Pro, and GTD (GT3) classes across roughly twelve rounds per season including Daytona, Sebring, Watkins Glen, and Road Atlanta.
Endurance events nearly always run multiple vehicle categories simultaneously on the same track. Prototype classes (LMP2, Hypercar) run alongside GT classes ([[gte|GTE]], LMGT3, GT3) and sometimes lower-tier categories. Blue flags, lapping traffic, and class-position awareness become critical skills — a prototype driver may lap a GT car every three to four minutes, making traffic navigation a significant factor in class results.
Endurance racing translates directly and faithfully into simulation. [[iracing|iRacing]]'s Special Events — including the annual [[24-hours-of-le-mans-virtual|Le Mans Virtual]] and Daytona 24h equivalent — replicate real endurance formats with multi-driver team stubs, stint limits, and class-based multi-car fields. Driver swap functionality, fuel strategy tools, and tyre wear modelling all serve endurance-specific simulation needs that pure sprint racing never demands.
[[24-hours-of-le-mans|24 Hours of Le Mans]] — the discipline's centrepiece event
[[24-hours-of-daytona|Rolex 24 at Daytona]] — IMSA season opener
[[24-hours-of-nurburgring|Nürburgring 24 Hours]] — the Nordschleife endurance classic
[[24-hours-of-spa|Spa 24 Hours]] — Belgian GT endurance flagship
[[fia-world-endurance-championship|FIA World Endurance Championship]] — global top tier
[[imsa-weathertech-sportscar-championship|IMSA WeatherTech Championship]] — North American counterpart
[[gte|GTE class]] — the production-based GT tier that ran 2011–2023
[[iracing|iRacing]] — primary sim platform for organised endurance racing
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