I just dropped off my tires at the shop for replacement. I got a year and a half out of them. I am thinking ballpark 500 hours. I went from Walker 4 ply (Dico I think was MFGR) to a 2 ply that the tire dealer has in stock. BTW this will be the third set starting at 1027 hours. I was out working yesterday and saw the tire was really low. Slow leak somewhere and most of the tread was worn. I can't afford downtime now so 65.00 will keep me moving. How long do you folks get out of a pair of skins?