Speaking from past experience (I was a M/C mechanic for 12 years, but no longer) w/the Busa they will charge four hours flat rate for a full (stress FULL) tune and service. This should include everything from valve adjust, plugs, oil and filter change, drive chain adjust, down to battery, cable inspection, etc... not to mention all the tidbits - they will have a checklist.
Now it is pretty well known amongst the dealers that the service shop will bill as much as possible whether all the work is done or not (e.g. valves needing adjustment). You all know as well as I do that not having to do the valves cuts almost 2-3 hours right there.
Here's what I do, and no reputable dealer has refused:
Since the valve adjustment is the most expensive and most critical (see done right) have the service manager put on the work order before you sign it that you want the clearances and shim sizes logged before and after the adjustment. When you pick the bike up if they say a valve adjust was done then you have as much proof as reasonably possible, plus you have the shim sizes for future ref if you want to do it yourself or something silly like that (see mental and physical torture)... If they do not provide all that you assume the valve adjustment was not needed and have them adjust the bill accordingly. It's a big pain in the butt the first couple of times but if you keep a stiff upper lip I've found that later visits the dealers will always give you the benifit of the doubt, their best work (and best mechanics too!!), and much better treatment then their normal customers in any department.
Rob