Depends on the bike. I've got a 500cc air cooled Suzuki twin that I've beat the crap out of for 30K miles and it still runs strong. In fact, I just put it on a dyno and it put the same power to the wheel it did 10 years ago. As mentioned, maintenance is key. Just about any later model bike - particularly Japanese made bikes, will go 40K - 50K or more with normal maintenance like oil changes and valve adjustments - and far beyond if you keep an eye on cam chains, etc. in higher mileage motors.
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