Formula 1 fans will notice that every grand prix lasts both a different number of laps and length of time, which makes it unlike some other motor racing categories in the world.
This is because the series runs to a specific distance rather than amount of time – like the Le Mans 24 Hours, 12 Hours of Sebring and more – due to the various circuits its calendar holds. This is to ensure every race is roughly the same length, because 70 laps around Silverstone could take double that of 70 laps in Montreal.
