I bought my TTs in october 2015 and did approximately 22 races on them, probably about 6 x 70.3s (the last Busso 70.3 in May this year) and the rest ODs and sprints. There were probably about 10 training rides done on them too when I couldn't be arsed taking my race wheels off. Zero punctures in that time. Road surfaces mostly pretty good. I'd guesstimate 1200kms/750miles? I sold my race wheels last month along with the tyres, which still looked in good nick. Will probably buy a set of TTs again. I had Rubino Pro Slicks before and had 3 flats in 20 races, luckily 2 were as I was coming into transition, maybe that was just bad luck, but I won't be touching those again!