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Depends on the shop labor rate. In Manhattan it can be $200 and more per hour. Out of the city you can get under $100. Other parts of the country vary.
Cylinder #'s 1-5, 1.5 -2 hours, getting to cylinder #6 add another 1/2 to 1 hour depending how well the mechanic can contort his hands and fingers. Usually the degree to which the mechanic can contort is inversly proportional to his shop rate.