Certified Mail is not an express or priority delivery option. It is an add-on service to First-Class mail, which means it travels at First-Class speeds. And First-Class mail is being slowed down by the USPS in order to save money and become more profitable. This is a different topic, but we suggest First-Class mail is delivered within 3 - 7 business days. Back to Certified Mail, it's difficult for Certified Mail to get delivered at even First-Class speeds, especially if you've purchased Return Receipt (RR) or Electronic Return Receipt (ERR) because this requires the mail carrier to knock on the recipient's door and try to collect a signature. The mail carrier will try a few times and then place a notification on the recipients door or in their mail box for them to arrange for another delivery time or request that the recipient pick up the letter at the local post office. All of this could mean your Certified Mail with RR could take 7 - 20 days for the delivery to occur.