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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.
Location: London. Ratings: +2,494. depending on the size of your item, 15 days is not a time period to worried about especially as it was First Class International (Remember, USPS or the United States Postal Service is basically the American equivalent of Royal Mail).