I put about 11k miles on them before swapping them out. So one whole plow season. I don't keep track of how many miles I actually have the plow on so I really can't answer that accurately.
I should also mention that my son's friend's dad has a '16 Ram 2500 (6.4 gasser, 4x4). He doesn't plow but does travel a lot for work. He loves the Transforce AT tires.