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Using First Class Mail International, deliveries generally take between 7â21 days to arrive, although the USPS does not guarantee delivery dates or times. Mail may travel to its destination by ground, air or a combination of both.
First-Class Mail Times. The United States Postal Service reports that letters sent as First-Class Mail should take between one and three business days to reach their destination. This duration depends on how far your letter must travel to its destination.ize and Price. For your letter to qualify as First-Class Mail, you must place it in a rectangular envelope. The weight restriction for First-Class Mail is 13 ounces, which is important to consider if you're enclosing hefty items such as magazines or photographs in your envelope.