priority shipping how long varies depending on the carrier and destination. For USPS, Priority Mail typically takes 1 to 3 business days for delivery within the United States, with delivery times depending on the distance from the origin to the destination. For international shipments, Priority Mail International usually takes 6 to 10 business days. Other carriers like FedEx and UPS also offer priority shipping options, with varying delivery speeds and guarantees, such as next-day or 2-day delivery for urgent shipments, depending on the service selected and the destination.