There are many factors which will determine when your tires are toast. Long tracks, like VIR, are kinder to heat cycles than a short track with many turns which require a lot of brakes. At VIR, with the E92, I try and change every 3 to 5 events mainly to have the best grip as soon as possible once on the track. After 5 events, if I would be patient, the tires will heat up, and in two or three laps will be gripping fine. I instruct, and mostly have students riding with me when on the track, and there fore want the best out of the tires as early as possilbe. Unless you run over something, I would think that it will take some time to ware them out - unalbe to estimate when that would be. I have seen them corded, but never experienced that.
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