Ethan,
Any time you have long delays between laminations you allow amin blush to come to the surface. If this goo is not cleaned off there will be a poor cross link between layers.
One school of thought is called "wet on wet". If you apply a second (or third) layer as the previous one is stiffening there's no time for the amin blush to come to the surface so cross linking is almost assured.
Charlie

: Do most people put the two layers on together on top of a dry hull, or do the
: first lamination and then come back at a later date and do the football?