At Rock Hill they'll last a little bit, might make it a season for you (mine lasted 2 1/2 ish, but you are there more than I am) but you'll just have to watch them. It's hard to say as there isn't really anything on the track itself that will chew through them too fast, but it really only takes one day nobody swept before you hit the track and you hit some debris that nicks it.
Fwiw I have used a Pista speed on the road before in a TT. (and even once at Dick Lane, which is probably worse than the avg road
) and been pretty lucky.
The rear will probably wear faster than the front just due to your weight distribution.