You are playing the "Root Beer Game" simulation with the above supply chain. The following table displays the inventory levels for all members of the supply chain:

Retailer $20,000$ cases

Wholesaler $20,000$ cases

Distributor $10,000$ cases

Factory $80,000$ cases

Customer walks into the Retailer and orders $70,000$ cases of root beer. Members of the chain are allowed to ship partial orders while they wait for the remainder of the order to arrive from upstream in the chain. How many weeks will it take for the Customer to receive their entire order of root beer according to the following specifications?