It should be from 1/2 hour to 1 hour of "shop time", plus the cost of gaskets and possibly something for "shop supplies" (e.g., the sealant used on the corners of the gasket). I don't know what labor rates are in your area. The gasket set probably retails for around $25; expect to pay full retail for that.
Crunch the numbers and figure it out. Or call around to your local shops. Generally an independent mechanic will be less expensive than the dealer. They may not have specialized knowledge or tools for a particular application, but valve adjustment is something any reasonable mechanic should be able to do.
-soD
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