1st class mail shipping time is a popular choice for individuals and businesses needing affordable and relatively fast domestic shipping. USPS First-Class Mail delivers packages and letters within 1 to 3 business days, depending on the origin and destination. It’s the most economical option for lightweight items, especially for smaller packages or documents that weigh under 13 ounces. While First-Class Mail offers reasonable delivery times, it does not include insurance or tracking for all items, making it more suitable for non-urgent shipments. However, for larger, more valuable items, customers may want to consider other services that provide tracking and added protection.