If you ever installed a wood floor you probably had the floor planks delivered three or four days before the actual installation. You may have been annoyed because you had to deal with that additional mess.
However, there is a reason for this. Your new wood planks need to acclimate to the temperature and humidity levels of your home. Wood is an organic product that expands and shrinks with humidity and temperature changes. If the wood was installed immediately the floor could show gaps or conversely buckle.