[Perfectlap]

^ I agree. Although I don't think most people are as demanding on final results to devote 20 hours. For most cars driven year round the bar is much lower. Eitehr way you'll be paying out the ears for a professional. Though it takes longer with an orbital vs. a rotary, you can figure out how to do this entirely on your own with the help YouTube and the internet forums.
Unless of course you're too busy a man to devote a full day to your car which I suspect is the sort of customer a pro detailer caters to. Anyone else is doing it for convenience rather than lacking the requisite skills. The same type who pays $150 to change an air filter at the dealer.