OK so I'm an anorak
I've just been looking at last years results from the Chester MC 1 lap sprint
Starting from the old pit lane exit, full lap of international circuit to timing line just round the hairpin fastest time of the day was 75.5 seconds by a Pilbeam MP88 Dont know how that equates to a racing lap in a car or bike race but its very fast to watch
There may only be a few cars on track at any one time, no overtaking but sprints give a wide variety of cars and some very fast drivers, as well as mistakes and incidents to deal with as Ian alluded to in an earlier post and in my experience clubs and drivers who appreciate marshals