Well it's treadwear rating 300 anyway to give excellent grip as they're UHP class tires. Should last until 50-60k kms depending on driving style which is acceptable provided the performance level they give. Some tires even have less treadwear rating such as Toyo T1S & Yokohama Advan Sport at 240 rating only. If you want long lasting tires  then should go with rating of >400 which will be lower class performance wise. So there's always a trade-off.