How long does mail from Pennsylvania take to arrive? Photo Credits hand mit brief image by Dron from Fotolia. Customers can purchase Delivery Confirmation on Priority Mail packages. How long does mail from Florida take to arrive? Packages dropped off at a post office during business hours usually leave that day. These services help businesses get everything from appointment reminder postcards, to customer-ordered goods out the door and on their way to the customer. Some packages may take longer to arrive due to mailing delays.
Definition of first-class mail in the vietnamhistory.info Dictionary. Meaning of first-class mail. What does first-class mail mean? Proper usage and pronunciation (in. First-class. First-class mail in the U.S. includes postcards, letters, large envelopes (flats), and small packages, providing each piece weighs 13 ounces or less. USPS first class mail, vietnamhistory.info allows you to print first class mail postage stamps online.