USPS Priority Mail typically takes 2 to 3 business days for delivery within the United States

. It includes tracking and up to $100 insurance with most shipments, and there are no extra charges for residential, rural, or Saturday delivery

. However, Priority Mail is not a guaranteed service, so delivery times can vary depending on the origin and destination, and occasional delays can happen due to postal system backlogs or disruptions

. Priority Mail is delivered Monday through Saturday, with no Sunday delivery except for Priority Mail Express, which is a faster, guaranteed service option that delivers within 1 to 2 days and offers Sunday delivery for an additional fee

. In summary:

• Standard Priority Mail: 2-3 business days (not guaranteed)
• Delivery days: Monday-Saturday (no Sunday)
• Tracking and insurance included
• Possible delays depending on postal conditions and locations

For time-sensitive or high-value shipments, alternatives like UPS Ground or FedEx Ground might offer more reliable delivery guarantees