Question: “Does the USA have to wait 7 days after Iraq’s rate change or all changes at once…?” It will all happen at once. You cannot have a duel exchange rate…it will be instant. One day you’re going to wake up and see on the CBI the new exchange rate. It will be across every board, market, trading center everywhere…as soon as the button is pressed the numbers are adjusted. [NOTE: You can always see the latest official CBI rate in the left column of this page.]