This article explains how long it takes for a refund made through Amazon to be applied to your credit card.
How long does it take for my Amazon refund assets to reach my credit card?
The refund is applied to the buyer's credit card minutes after an agent completes a refund transaction.
However, it typically takes 3 to 5 business days for the assets to appear on the buyer's credit card statement. This timeframe depends on how long the buyer's bank takes to process the transaction.
The same is true for gift cards.
Please Note: The seller (EK) holds the right to cancel the refund for returns that are not post-marked (shipped back) within the 30-day return window.