It can last for several Seasons
Just make sure that you are using ablative bottom paint. We only keep our boat in for 5 months a year, and it lasts around 3 seasons. It is in brackish water, so it's more important, otherwise we would get barnacles. Ablative paint can be scrubbed off if you had to., otherwiser, it just slowly disolves in the water. The older bottom paints had to be scraped or blasted off. It's no fun to scrape the entire bottom or a C-22. Aldo