[ReelMagic]

The paint manufacturer most likely has a recommend time between coats listed on the paint can  itself....  Also I'm not sure why you want to use 2 coats as I use only one and stay in the water for 2 years between hauls. The bottom is in great shape after 2 years and NO growth. I agree with others that posted in that you don't want a build up. To much of a build up would then require the bottom to be stripped.. One of the primary reasons they deveoped ablative bottom paints is to minimize paint build-up.  M2C