Usually overnight is fine but knowing the types of paint (on and going on), thicknesses and condition of existing paint, temperature of hull, temperatures throughout drying times, humidity are all supposed to factor in.
Not sure that it matters. Many times I have seen a yard, haul a boat, pressure wash it before lunch and start painting after lunch and the paint is fine for the rest of the season. Will it last 3 years? Can't say as that's usually the cycle where I am.
If using an Interlux product, I have found their tech support very good.