I cut an average of 5 yards a day. The yards are on the small side averaging 12,000 sq foot. In westen PA there are a lot of hills. I use a Honda HRR216K5VKA. I change the oil every two weeks. My question is how long will this mower last? This is my second year in this biz. So far this mower has worked really well. Thanks in advance. Love this site.