I've got almost 400 hours on my Kubota 227G with the 60" deck. It takes about 10 hours to mow in rough terrain and around a myriad of pecan and black walnut trees (which love to drop limbs). What I mow is green but I wouldn't call it grass except for what is immediately around the house. I change the blades at least 3 times each season and keep up with all the recommended maintenance. It is one tough machine and pasture grass doesn't stand a chance with it.