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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.
The New York ISC, or International Service Center, processes most inbound international letters and packages quickly, releasing them within three days. During busy times, such as the winter holiday season, items take up to 10 days to move through the facility.