Well, for what it's worth, I could stand a 30-minute to 1-hour race, I think...
But no "standard clean WRS rules." Turn on the Penalties in the game, and let the game determine what's clean and what isn't... That way we don't have to actually watch all the replays -- just fast-forward to the end to verify the final time that each racer posted. Much easier that way, in my opinion...
And definitely something in the LM or F1 style. No oval-tracks, no "standard" sports cars, no normal or sports tires...