Not that I'm in a position to buy one right now, but if I were, I'd DEFINITELY track it ... as much as possible!!!
But based on my own track record (ha, ha, ha, ............shameless pun!) I only do a handful of track days a year anyway, compared to daily driving whatever car I've got, so even though I voted 20% - 40%, I'd probably be hard pressed to exceed ~20% of the car's driving being on-track.
If I could AFFORD it, the car would be ~60% - 80% track use, but still get plenty of fun street miles in too