Well i first had them about a year ago ,got them from Wozza as he was getting new tyres,( and i needed some newish ones to put on as mine where knackerd) but the Dunlop sport maxx he gave me of his car still had at least 2.5-3mm left so i had them from him ,and they lasted me approx a year before buying some new Dunlop sport maxx as i was really impressed by them..
But after the length of time me and wozza both had them i would say they lasted the best part of 20k miles....