They want the paint dry enough to stay on in the slings. I used to have a very light boat (1300# Stiletto 27) I launched many times with less than an hour to dry. One coat in the morning, one a few hours later, and launch. Because the boat weighed little, if it was dry to the touch, it wouldn't come off on the slings. Less true if the boat goes 40,000#.
Yeah, I would paint between tides, if I could rinse it with fresh water and get the water to dry.
CSC and Micron 66 are all I know.