I'd still ask him his rates as he has given you the hours. NEVER take anything for granted....and the "additional" to replace the clutch at the same time should not be over 1/2 hour.
In my opinion.....and around here, local shops are 75-85 an hour while dealers are 95-135 per hour. I do know a "jam up" mechanic who works weekends at his shop for 50 and hour and is as good a mechanic that you can find.
Yes, ASK before you get the bill and also look for charges for the grease, shop rags and some charge a "disposable" fee for whatever they can think of. To be informed is knowing all you can before hand.