It is sort of like asking, does it shorten the life of your truck pulling 2 lawnmowers more than if I only pulled one on a trailer? It may shorten it a bit, but not much. I now have almost 3,200 hours on a Kohler 22 that has powered double blades only. I've never used single blades on either one of my Dixie Choppers or the first 2 that I had either. I hope this helps.