Priority shipping USPS time refers to the delivery time for USPS Priority Mail, a service that guarantees faster delivery for time-sensitive shipments. Typically, Priority Mail offers delivery within 1 to 3 business days for domestic shipments, depending on the destination. This service includes tracking, and many packages are delivered with priority over standard mail, ensuring faster processing. USPS Priority Mail is ideal for customers who need to send packages quickly but at a lower cost compared to overnight express services. The service also includes insurance for packages up to a certain value, making it a popular choice for valuable items.