Michael has credit card debt of $70,000 that has an 14​% ​APR, compounded monthly. The minimum monthly payment only requires him to pay the interest on his debt. He receives an offer for a credit card with an APR of 6​% compounded monthly. If he rolls over his debt onto this card and makes the same monthly payment as​ before, how long will it take him to pay off his credit card​ debt?