Just do a high speed beaching once a week!! may want to lift the motor before you hit. I've left my boat in the water for a few weeks (mooring) with nothing but a specific bottom wax with no problems, I did use the boat 5 times a weeks during that time and I'm sure that the constant high speed runs are what prevented growth. There is no way I would go more than a month without paint, even a month is pushing it depending on how your water is.
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