Maintance. I have about 20K on my car over 15 years. So lets say 1.4K a year. I did about 30 total days at the track over that time. Each day was about 130 miles of track time or about 600 miles a year on aveage but in the early years I didn't track it and so the later 10years resulted in more track days but lets just say it was about 750 a year over those later years.
So a more recent year would have about 750 track miles over 4 or 5 weekends and about the same amount of street miles more or less.
I spend about 6 to 8 leisurely hours (a couple of beers and lunch included) doing a track week end prep work up each time. I also have a good hour worth of look over about every 3 or 4 weekends of normal street driving just to see whats falling apart, off, or loosening up. Tire pressure, oil level, gearbox oil check etc. Then in January each year it gets a complete fluid change, reset rockers preload, check timing, re tighten everything, brake rotor (cracks) pad (overheat cracks) check, general cleanup and go over. Call that a weekend or another 12 hours or so.
So lets call it 40 hours of track prep, winter 12 hour, about 10 more of general poking around the car from time to time a year. 62 hours a year or a hour every 24 miles of run time.
I guess you can do less and see what falls off, then fix it. Seams to me that spending 70-80 grand on something and all that time and effort just to wait until it falls apart to fix it doesn't make much sence, but whatever, just don't take people you like for rides and keep off the track.
Cheers.