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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.
â¢ Duration: â¢ First class mail delivers an item within 2 â 3 days. â¢ Priority mail takes 1 to 3 days to deliver an item. â¢ Insurance: One major point of differentiation between express and priority mail pertains to compensation through insurance. â¢ For first class mail you can add insurance as an option if you want to.