How many years can a person serve as president

A person can only be elected to be president two times for a total of eight years.

Explanation:

U. S. presidents are limited to serving two elected four-year terms in the White House and as many as two years of another president's term. That means the longest any president could serve is 10 years, though no one has been in the White House that long since Congress passed the constitutional amendment on term limits.

The Twenty-Second Amendment says a person can only be elected to be president two times for a total of eight years.