It took a while, but after 31 days in the Bahamas in summer, here is the answer for original gelcoat.
two weeks: no problem, no significant sign of fouling.
2.5 weeks: here it comes, light scrub took care of it
3.2 weeks: scrub again, harder, worse at the water line.
3.8 weeks scrub again, lots of algae, well stuck, no barnacles.
It worked, but I'd rather not try 6 weeks.
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