According to the Twenty-second Amendment to the Constitution, ratified by Congress on February 27, 1951, "No person shall be elected to the office of the President more than twice, and no person who...
A president can be president for 8 years max
They serve in four year terms. Currently, a president can only serve 2 terms.
Normally the President of the USA is president for 4 years unless they get kicked out or get elected for the next 4 years which would make it 8 years.
4 years, 6 months and 10 days