I would suspect that pulling you at 30-33 mph, the 3.0 will be pulling you at close to around 4000 rpm. The 180 with my family (of 4)in it cruises at about 25-27 mph turning 35-3600 rpm with the aluminium prop on it (sorry, can't recall the numbers on the prop right now, I'll have to check for ya). I don't know if that would affect longevity or not, as it is still well within the normal operating range for that engine.
From what I had read before we bought our 180, the 3.0 is a pretty tough little engine, some have even said that it was tougher than a 5.7 (just what I had heard). It definately is not the smoothest or most refined power unit though.
I would agree with LouC, at 100 hours a year, you are talking 15-20 years out of the engine before a rebuild, and that sounds plausable if the engine is maintained correctly.
_________________ 2009 H180 w/3.0 Merc Homebuilt Minimax Hydro 2011 Zodiac Cadet 310 
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