How many terms may a President serve according to the US Constitution?

The Twenty-second Amendment to the United States Constitution limits the number of times a person may be elected President to two, provided that person has not held the office of president or acted as president for more than two years. In the case of someone who has held the office or acted as president for more than two years, that person may be elected only once. Constitutionally, then, a person could actually serve for two and a half four-year terms. You know its also one of the most importint Amendments!!!