What is the a maximum number of terms a president may serve?

Eight years is the limit for most Presidents. However, it theoretically possible for a President who was first a vice-president who finished out another person's term with two years left to serve for 10 years by being elected to two more terms of his own.
An American president can serve two terms, or up to eight years in office by today's standards. There was a president who served four terms, but after his presidencies the constitution was amended so that they could only serve two terms.