Should the item you’ve ordered be out of stock or not available for immediate shipment, it may not be delivered within the standard two business days associated with Amazon Prime. Opting for One-Day or Two-Day Shipping shortens the transit time to one or two business days after the order has been shipped, but it doesn’t expedite the item’s procurement or preparation for shipment. The shipping method’s timeframe initiates upon item shipment; hence, with Two-Day Shipping, it may take up to two business days for the item to reach you after it has been shipped.