priority mail usps time refers to the delivery time for packages sent via USPS Priority Mail. This service is designed to deliver packages quickly and reliably within 1-3 business days, depending on the destination. USPS Priority Mail includes features like free package tracking, insurance for up to $50, and delivery on weekends and holidays. Priority Mail is an excellent option for customers who need a fast, cost-effective solution for shipping items of various sizes and weights. Delivery times are guaranteed for domestic shipments, but international deliveries may take longer depending on the destination country.