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Last year I did 22 track days and 20 autox events. I used 2 full sets of Falken 615k+ and about 25% wear on a set of RS4's at the track and 6 full tires and another 25% wear on another set of RE71r's (I ran a set of sticker RE71r's in January at a 2 day track weekend and wore the passenger side tires to the wear bars).
My second set of Falkens stayed on the car their whole life (just a couple of months, they lasted about 8 trackdays and saw fewer than 5k street miles before they heat cycled out), they didn't last as long as my first set of Falkens which lasted for 10 trackdays and fewer than 2500 street miles. The RE71r's typically see less than 2k miles in their lives and last for an average of 100-150 runs depending on the venue and weather.
The RE71r's can keep up with 100tw tires like the Nitto NT01 for a couple of laps (the stones heat up faster and are good to go after half a lap in nearly any conditions, but by the 4th or 5th hot lap they are greasy and times fall off substantially). The stones like low pressures at autox, but if you run them low at the track (under 30psi hot) they wear very quickly (that's how I ruined half a set during a 45F degree day).
If I've only got a week between events (my commute is 12mi round trip), I don't feel bad leaving either the RE71r's or the Hankook RS4/Falken Azenis 615k+ on the car. 2 weeks is a coin toss depending on the weather and how beat I am after the event. I almost always put the tires I'm going to run on the night before (the farthest I drive to the track is 70mi) but I might change them at the track depending on the circumstances.
The RS4's and 615k+ are great track tires and are very consistent. They are slightly slower than the re71r's on the track (significantly slower at an autox), but they are close enough that a fast driver can keep up or outpace a lesser driver on the stickier options. My current set of RS4's are on pace to last more than 12 trackdays, and I paid about $600 including shipping and installation for the set. I might be giving up 1-1.5s to some NT01's but in similar sizes the Nittos are at least $100 more and I'd be surprised if they lasted half as long.
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