How long will it take for the flooring to dry out?
Simply, not until the “cupped” flooring has lain down close to it’s original flat surface. If the floor is uneven on the surface then the moisture content is too high to sand and refinish as “crowning” may occur after the floor has dried. Wood products will maintain about 6% moisture content (MC) in our dry climate. New flooring materials have a 6% to 9% MC. Even though your floor “looks dry” the moisture content may be considerably higher than normal level for your home.