usps how long does it take to deliver varies based on the service chosen and the destination. USPS offers several delivery options, each with different timeframes. For example, Priority Mail delivers within 1-3 business days, depending on the destination, while First-Class Mail typically takes 1-5 business days. USPS offers faster services like Priority Mail Express, which guarantees overnight delivery. For international shipments, delivery times can range from 6-10 business days with services like Global Express Guaranteed.