It depends on what type of flooring you are doing. As said previously, minimum 2 days. This time of year the humidity is low so the flooring will likely not be swollen. Some floating floors have a plywood layer glued to the bottom and those are very dimensionally stable. Many of the prefinished options have very low moisture levels if stored indoors before delivery to you.
My Bad it is 3 1/4" hardwood 3/4 character grade white oak flooring