Mine get tossed every 2 months max, sooner if the shift gets rough, I don't bother measuring them, but they do get cleaned and lubed at least twice a week no matter what. Mind you I'm doing between 800-1500 miles a month now
KMC X10 SL (Ti & Gold) Chain, Dura Ace cassette, Rotor Q Rings, Sram Red Mechs.
Mileage includes general rides, club rides, chain gangs and racing