How long does it take for full cylinders to arrive after I have given the exchange box to USPS? </h1><p><br></p><p><style type="text/css" id="isPasted"><!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->The delivery time will then be 2-5 days. When the new order is on its way, you will receive an e-mail and a tracking link. </p>