It seems like that when you guys talk about changing your blades in the field you act like it only takes minutes to do. If I was to crawl under my mowers when I thought they might be dull, it would take at least an half hour or more to change them and get sharp ones on. How many sets of blades does everybody carry on their rig ? Do you change them once a day or every week? Please give me your input on this issue , it's greatly appreciated.