Admin
If you drive your car once a week, 100 would be OK though if you drive every day, I would recommend 200-250 if you still want some performance and still have some tread left after 6 months.
Thanks, that's good info. Now you can probably see why I chose my current tyres.

asimovy
RSRs will last for quite some time. I had a set with my NA while I was dailying it, lasted for 8-10 months with probably 10-15 track days.
For what they are, that's awesome! I don't do many trackdays, so they would last even longer for me.
Tree
I wouldn't condone semi-slicks because
1. You might not utilise the full potential (my experience which is not much!) since you say you're not regular. Also less grip will teach you more when it gets "interesting"
2. Have to carry them to the track unless you don't mind pissing money wearing them out
3. Have to fit them at the track and take them off (personal gripe)
Lots of good points there Tree!
Street tyres are fun and more of a handful at the track, which is good for gaining experience, especially in a high powered car like mine. That's the main reason why I'm happy to use street tyres until I decide that I can't possibly reduce my lap times any further without semi slicks. I will be pushing myself much harder at the upcoming MTC compared to the last one though, so the street tyres will be holding me back for sure.
Anyway, I was looking at the available tyre sizes for RSRs, and in doing so I was reminded of something very annoying. With my 18 inch wheels, the front tyres MUST be 35 profile. I know this because I once tried 225/40 tyres on my 18 inch rims and I couldn't even turn full-lock without the tyres rubbing against the wheel wells. Also, most of the available 35 profile tyres for 18 inch rims are too wide for my 8 inch front rims and tiny clearance from the coilovers.
Soooo with that in mind, if I decided to go for semi slicks just for the track, then it seems I would have no choice but to buy some 17 inch track-only rims. With 17 inch rims, the rolling diameter of 40 profile tyres is roughly the same as 35 profile tyres on 18 inch rims.