Which Grand Prix is the longest Formula One World Championship race by elapsed time?

The 2011 Canadian Grand Prix is the longest Formula One World Championship race by elapsed time.

Held at Montreal’s Circuit Gilles Villeneuve on 12 June 2011, the race lasted 4 hours, 4 minutes, and 39 seconds. Heavy rain caused a red-flag suspension of more than two hours, but the race clock continued to count under the regulations in force at the time.

The extraordinary event eventually ran to the full 70 laps. Jenson Button won for McLaren after starting near the back, recovering from several incidents and making a late pass on Sebastian Vettel. Vettel led most of the race but ran wide on the final lap while under pressure.

This record concerns total elapsed event time, not the fastest average speed, greatest distance, or longest green-flag running time. The 2021 Belgian Grand Prix is often mentioned in comparisons because it lasted only a few laps behind the safety car after rain, but its elapsed duration was far shorter.