How long does the President have the power to do it?

The Twenty-Second Amendment says a person can only be elected to be president two times for a total of eight years. It does make it possible for a person to serve up to ten years as president.

Explanation:

Today, the President is limited to two four-year terms. But when the 22nd Amendment to the Constitution was ratified in 1951, a President could serve an unlimited number of terms.

on the morning of  july 21,  1861, general mcdowell ordered the  unionarmy to attack. it was on this hill that  confederate  colonel thomas jackson and his forces held back theunion  troops.