My answer: I have to do the life-draining 24 hour Nurburging race if I want an F1 car. There's no way I'd do that (I might though) even if I can b-spec the race down to 8 1/2-some hours.
Please stop creating useless threads, we've already got threads on GT4 Bugs, race guides that tell you how to win every race, B-spec, A-spec, missions & licences, best cars, favourite cars, worst tracks, worst cars, etc.