There is no "real informative" answer to your question imho. By the book maint (or faster intervals such as changing fluids each year) is predictable and measurable. But, "breakage" varies so much and - in cases of bad luck - will be far more than the maintenance. Or not, if one is lucky. You will get input from folks all across the luck spectrum. But then your luck will be its own. I guess you could attempt to average or understand the worst case...but neither is likely to be your case.