Depends greatly on crops, conditions, and how many machines making dust in same area. I've seen less than 500hrs on the I6 machines running edible beans with two machines running together. I've seen over 2000hrs on some V8s with original non-coated blade but getting high time to replace. I'd have to check some prices but I believe you could do a quick blade swap with standard blade for $500US range on I6 and or as high as $1500US for coated blade switch on the V8s. Hope that helps