Armidale Tech Solutions sells Flash model laptops that cost $$562$ each and retail for $$998.$ Weekly demand averages $15$ units. The cost of placing an order with Flash is $$50,$ and the lead time is four weeks. The annual inventory holding cost rate has been calculated at $20$ percent. If the retailer is out of stock of the laptop, it estimates that it will suffer a combined cost of loss of goodwill and administration expense of $$10$ for each week that a customer must wait for the laptop to arrive. How many calendar days between orders will there be$?$