United States Postal Service priority shipping takes one-to-three business days, and the arrival date depends on where the package originates and where it is being sent. USPS priority shipping to a military post office, including APO, FPO and DPO, may take longer.
Large and small envelopes; large and small boxes; and containers no larger than 108 inches combined length and width qualify for one-to-three day shipping. Priority shipping includes tracking when purchased online or at a retail location. Flat rates are available for priority mail up to 70 pounds, and insurance is usually included. Saturday delivery is available at no additional charge, and residential and rural delivery are included in flat rates as well.