According to U.S.Customs,the 24-hour rule states that all goods sent to the United States must be picked up within 24-hours of receipt to ensure that goods do not linger in receiving warehouses too long.

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The 24-hour rule, also known as the Importer Security Filing (ISF) rule, requires importers or their agents to submit specific information about ocean shipments to U.S. Customs and Border Protection no later than 24 hours before the goods are loaded onto a vessel bound for the United States. It does not pertain to the pickup of goods once they have been received in the United States.