My practice on my sailboats is to have th bottom cleaned every 3 months by a diver. He also checks the zincs and replaces them as needed at the same time. It is likely overkill, but I only haul out if I need to do some repair or major work, when the diver says the bottom paint needs to be redone, that is when the bottom is painted. On my sailboat, the bottom paint lasted a good 7 years with that routine.
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