I have tried to split between A-Spec and B-Spec, but since I have two other brothers living with me, one of which owns the PS2, I have to finish one 24 hour race once a year. During the day. I cannot leave it on overnight, but it's just as well; I like seeing how my competition does over 24 hours. Besides, it would be unfair to them if I stayed on for 10 hours, let alone 24 hours or a week.
So, I voted for B-Spec.