They don't last too long if you run them aired down with lockers. The tread width is kind of narrow for a 12.50 section-width tire.
I have used mine probably 40% offroad and 60% onroad based on mileage. As far as hours, probably 95% offroad. I ran them on the expressway for 1000 miles and they tend to heat up a little more than I like with 33lbs front and 30lbs rear. A lot of those onroad miles were from last summer when I ran with 24lbs front/18lbs rear almost exclusively because I was going out in the woods no less often than every few days (but speeds rarely exceeded 45mph).
I've got around 9,000 miles on them including the 3,000 miles or so I figure were on them when I go them. There's about half tread left. But, like I said, they have quite a few miles on them being aired down and the thousand miles on the expressway seemed to heat them up quite a bit.
I don't have any real complaints other than the narrow section width. I haven't had any punctures with them.
If I were going to buy new tires on a budget I'd probably get Kumho Venture M/Ts.