Well after this weekends runs(12 total with my wife co-driving) the front tires blistered up about a third from the outer edge and are done. I didn't notice until I pulled them off after the event. I assume the rears would do the same within a few runs if they were ran up there. So figure 90 runs to kill them, but never corded the edges due to flipping them. Probably would get about 75-80 as I mentioned previously, unflipped.
On a side note, I attended a Volvo driving event in which they were giving away an iPad each day for the fastest run on their "autox" course. Bunch of SCCA guys went, and I won. The eventual sale of that should get me close to the cost of a new set of Hoosiers for next year.