Priority Mail shipping upgrade (flat rate envelope or small flat rate box). The Post Office designates a delivery time frame of up to 3 business days after the package is shipped (typically 2-3 business days). Please note that this purchase only adds postage funds towards Priority Mail shipping and does not rush the manufacture of your order. Your order will be processed according to regular processing policies and, once your order is complete under regular guidelines, it will be shipped via Priority Mail with this purchase. Please inquire if you need Rush Order Processing.