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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.
Rating Newest Oldest. Best Answer: USPS first class mail in the United States from state to state takes 2-3 business days. Priority mail takes 2 days but it is not guaranteed. This will also depend on how long the ebay shipper takes to ship the item - some take up to 5 days if they are high volume.