What do you do for a living? http://al4a.fun al4a In the case of promotional financing offers, learn how long you have to complete a qualifying transfer, and the length of the promotional financing period. Typically, promotional balance transfer offers must be completed within 30 days to four months of the account opening, and can last from between six and 18 months. Keep in mind that even though the terms might not explicitly say so, banks will not allow balance transfers between their own accounts.