One term of presidency is 4 years, and a president can serve 2 terms, if they are re-elected. This equates to 8 years at the max. However, if a person was the vice-president and becomes president at...
George Washington, 1789-1797 John Adams, 1797-1801 Thomas Jefferson, 1801-1809 James Madison, 1809-1817 James Monroe, 1817-1825 John Quincy Adams, 1825-1829 Andrew Jackson, 1829-1837 Martin Van...