The expected standard mail delivery time in the United States is two to eight business days. This varies depending on several factors, including the distance the item has to travel and the size of the package. Letters and documents generally arrive more quickly than large packages.
Items sent by standard post travel by ground transportation. This is the slowest option offered by the U.S. Postal Service, but it is also the least expensive. The USPS recommends it for deliveries that are not urgent as well as for packages that exceed the size or weight limitations placed on Priority and Express Delivery.