(this obviously depends on the size of the tyre)
For 10" A032R's you'll usually get about 6hours around a racing track before they are stuffed.
For hill climbs I would suspect that it would take a while to wear it down to nothing (based on how long hill climbs go for). I would dare say that the rubber will go pretty hard and loose most of its grip before you wore them out. So it really comes down to how sticky you want your tyres (eg how often you replace them.
_________________ "In two years time your car will be like a lady's clothes, out of date, my car will still be in fashion when I am dead" - Sir Alec speaking to Pininfarina
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