Seriously 24/7.. sounds a little steep. I know most marinas charge more than car dealerships.. but $80/hr is the shop rate at the marina I deal with. About par with the GM dealer that just got me for $89.95/hr to fix my '98 GMC truck. Like I said..wish I could get this to work on airplanes... not like you can pull over to the side of the road when your prop falls off....
In that price they quoted you though... there's gonna be "shop supplies", taxes etc on top of the $40 for seals and the bottle of lower unit oil.