Productless - 2-3 hours
With LI and gel (FSG makes it dry realllllly slow) - 4 to 6 hours. The more product, the longer the dry time.
I had never heard that about about the moisture balance. I think it has more to do with texture, porosity, density and length. Course hair takes longer than fine hair, and non porous hair takes longer than porous hair, etc.