Final answer:
The current constitutional limit is outlined in the 22nd Amendment, which restricts a person from being elected president more than twice and from serving more than two years of a term to which someone else was elected.
Step-by-step explanation:
The current constitutional limit on the number of times a person may be elected president is outlined in the 22nd Amendment of the United States Constitution. According to this amendment, no person can be elected president more than twice. Additionally, if someone has served more than two years of a term to which someone else was elected, they cannot be elected more than once.