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For somebody to paint it is a question of how much they charge per hour. Professional would probably charge you a day.
Like Butch said if your boat is painted already then it is a simple DIY job easily done in a weekend which would include getting supplies, prep, and applying paint.
Interlux, Pettit and West Marine all make good bottom paints but I would chose the hardest formula available in the anti fouling paints.

Same question as Butch if it isn't painted, why?