how.long does priority mail take depends on the destination and service used, but generally, USPS Priority Mail provides delivery within 1-3 business days. This service is designed for faster delivery compared to standard ground shipping, and it includes tracking, delivery updates, and a guarantee for timely arrival. For most domestic shipments, Priority Mail is an affordable and reliable option for sending packages quickly. Shipping times can vary slightly depending on factors like weather, holidays, or other unforeseen circumstances, but USPS generally strives to meet the 1-3 day delivery window.