Basically you can get a free month of Prime if your qualifying Prime order is delivered late.
See this link for details.
Qualifying for a Refund under the Guarantee
We'll automatically refund your shipping costs when we miss a delivery promise for a guaranteed order under the following qualifications:
If you choose a guaranteed shipping option advertised on a product detail page when placing your order, ship to an eligible address, and complete your order before the deadline on the product detail page, we guarantee that your items will arrive on or before the delivery dates shown at checkout. This means we will refund shipping fees associated with your items if they are not delivered to their destination on or before those dates.
If your order contains other items that aren't eligible for Guaranteed Accelerated Delivery, and you do not check the box indicating you'd like to split up your shipments, you will not be eligible for the guarantee.
For your order to qualify for Guaranteed Accelerated Delivery, your credit or debit card must be successfully charged before the deadline displayed on the product detail page.
During the checkout process, if for any reason your items no longer qualify for Guaranteed Accelerated Delivery (for example, if the order deadline passes or if inventory runs out), you will not be eligible for the guarantee.
A signature may be required for some deliveries. If this is the case, an attempted delivery on or before the guaranteed delivery date meets our delivery guarantee.
A delivery appointment may be required for some deliveries. If this is the case, an offer by the carrier of a delivery appointment on or before the guaranteed delivery date meets our delivery guarantee.
Qualifying for a Prime Extension under the Guarantee
Amazon Prime Free Trial and Annual Members can receive a free 1-month extension when the promised delivery date is not met. They will also receive a refund if they were charged for upgraded shipping. Extensions are limited to 1 per free trial and 12 for an annual membership. Note: Free Amazon Student and Amazon Mom Prime Memberships do not qualify for this extension.
I'm sorry to hear you received your order late. This usually doesn't happen.
To help make up for the inconvenience, I'm extending your Amazon Prime membership by one month. The membership will now renew on May 23, 2013.
We hope to see you again soon.
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