Some normal ones for pickup races and some long ones for endurance racing. For pickup racing long ones really suck. But racing for 3 hours on Blackwood or Kyoto GP is a totally different thing, especially with 20+ cars in 2 classes. Blackwood is just so packed, if you're in a GT2 car, you're being lapped constantly. This is not so on long tracks as the field spreads out a lot more. It also helps if the tracks are wide since that makes more space for manouvers but narrow tracks are much mroe enjoyable in slower cars (Westhill is actually quite boring in GT2s - you must brake for T2, just slightly though, T4, again, slightly, the same story for the chicane, all of them are cleared in 4th gear, then the second chicane is 2nd and 3rd gear, the last turn is 2nd gear again. Most of the circuit is done flatout.).