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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.
Best Answer: USPS first class mail should be from 3 to 4 days. However, there are other options as well, such as Overnight, 2 to 3 day Priority mail and the two you should be concerned with are Ground, which can take considerably longer and Media Mail, which can take as long as two weeks.est Answer: USPS first class mail should be from 3 to 4 days. However, there are other options as well, such as Overnight, 2 to 3 day Priority mail and the two you should be concerned with are Ground, which can take considerably longer and Media Mail, which can take as long as two weeks.