Most manufacturers recommend that any hardwood product be acclimated in the space that it will be installed for no less than 72 hours. It is also important to arrange the hardwood boxes for acclimation in a way that would give equal airflow to all of the boxes, ensuring each box of wood gets the same level of acclimation. Generally stacking the boxes no more than 4 high and with at least 6” of space around all sides will suffice.