Based on time from what Brooke was commenting to. Our typical weekend in Calgary has about 3.5 hrs, when running the 2 hour enduro on Saturday evening.
They are as durable as they get. I ran some Kumho Ecstas on the weekend, and I found them to wear about 40% to 50% quicker than the Toyos, but my lap times were at least 1.5 seconds quicker.