The answer is "it depends." Location is key, and the kind of job you want.
Running your own shop will take a LOT more than 50 hours a week. You might spend 40 hours wrenching on the boat, but another 20 doing taxes
, customer follow up, bookkeeping, etc, etc. If you haven't run a business of your own it is hard to overestimate the effort needed.
If you are ok working for someone else, location is really important. A place with a large yachting infrastructure (like Annapolis
or San Diego) will have a lot more opportunities. If you are interested in bigger boats and more money
, servicing super yachts at a place like Fort Lauderdale
is a good choice.
If you have a ABYC cert and an engineering background that will get you in the door at a LOT of shops. If you really are good and a hard worker, you'll rapidly become indispensable--the best way to be.