It really does depend how the car was driven. The more agressive, the sooner the clutch will start to slip. My friend's SE-R has the original stock clutch with 150,000 miles...still goin strong. He can drive very agressively at times, but when he does, the shifts are VERY QUICK and VERY CONTROLLED. I think he's probably the quicker than some of the guys in the the bm_tsukuba japanese race video I have. So basically, it really just depends on how you've been driving it.