standard mail delivery time
First-class mail must weigh 13 ounces or less. Pieces over 13 ounces can be sent as Priority Mail. USPS first-class delivery is given priority over standard mail, and local mail will typically be delivered in 2-3 days. Nationally, first-class mail should be delivered in about 4 days. First-class mail postage includes forwarding and return services with no additional charge.