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Once every season. This is also based on your wallet.

If you use a cheap paint, it only lasts a year. If you use
a good multiseasonal ablative paint, it can last you longer.

That's why some of the paints are 50.00 and some are 160.00 (or more)
per gal.

Only thing I can recommend to you is that if the boat never had paint
on it b4, seal the hull with a good sealer and then paint on a
nice ablative paint. Epoxy paints are OK, but need to be sand blasted
as the years go on. Ablative ones wear themselves away as time goes on
and
let the owner know when its time to paint again.


Epoxies are meant as a barrier coat, not antifouling. Antifouling paint
goes over the epoxy barrier coat.

Here is a nice article on bottom paints:

http://www.boatus.com/boattech/paint.htm