I had an 07 ZX10R I bought new, owned for little over 3 yrs before totalling it. It had around 19,700 miles and about 10 hard ridden trackdays on it, still on original chain and sprockets when I wrecked it March 2010.
I know it had wider pitch chain and sprockets but it also put 3 times the power to the ground as compared to an NC, so power to chain pitch in terms of wear should be similar. Without external factors like dirty offroad elements affecting it, I would have figured NC chain and sprockets lasting well over 20-25k miles, especially for no more power than it has.
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