According to the United States Postal Service, as of September 2014, the expected delivery time for Standard Post, the ground shipping service that delivers to all U.S. addresses, is two to eight business days in the 48 contiguous states. Delivery outside this area in this time frame is not guaranteed.
One can use Standard Post to deliver packages economically in the United States. The service includes USPS tracking and can accommodate items up to 70 pounds and up to 130 inches, which are too large or too heavy for Priority Mail service. The USPS advises the use of Standard Post for non-urgent deliveries.