Amendment 22
1. No person shall be elected to the office of the President more than twice, and no person who has held the office of President, or acted as President, for more than two years of a term to which some other person was elected President shall be elected to the office of the President more than once. But this Article shall not apply to any person holding the office of President, when this Article was proposed by the Congress, and shall not prevent any person who may be holding the office of President, or acting as President, during the term within which this Article becomes operative from holding the office of President or acting as President during the remainder of such term.
Yep. So we are talking a MAXIMUM of 10 years, meaning slow Joe would have to serve at least two full years and the Veep would have to be elected and re-elected thereafter.
This was suggested by a caller to Mark Steyn today, but using Amendment 25 to remove Joe.