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On my first DE event two years ago with only 4K miles on my car I completely destroyed my front pads during my 5th 20 minute session. That caused some anxious moments but with a great instuctor by my side and having AH on we made it through and back to the pits. On a bright note, the rotors lasted many, many more miles and several more DE events.
You can't equate what you're asking with mileage...you're asking the impossible. Who knows what you're doing to your brakes?
I can't imagine "spirited street driving" would wear out your pads too quickly (at least compared to the wear and tear of running road course events). I wore OEM pads down pretty low running road courses but they weren't totally shot. I went to more aggressive Z-compound pads and managed to cook those on the track..glazed them pretty bad (and they were bedded-in beforehand). The (solid) rotors are doing well.
Fortunately, you can easily check the condition of your brake pads and rotors.