John Kennedy is the one associated with Camelot.
"time" or "time period" in office is the simple replacement. "tenure" in office might be what you want. His time in office is also referred to as his "administration" .
Camelot
Words that describe Camelot are a peacefulness, idealized beauty, and enlightenment during a particular place and time. When John F. Kennedy was in office, the period was known as the Camelot era.
A term
JFK's presidency is often referred to as the "Camelot years" due to the idealized image of his administration, which was marked by a sense of youthful energy, optimism, and a commitment to public service. The term was popularized by Jackie Kennedy, who likened their time in the White House to the legendary King Arthur's Camelot, a place of hope and inspiration. This portrayal was further solidified by the tragic nature of JFK's assassination, which imbued his presidency with a sense of nostalgia and loss. The "Camelot" narrative emphasized the promise of a better future and the belief in American exceptionalism during a tumultuous period in history.
When Washington was in office since there were no ex presidents.
=no=
Ronald Reagan and George Bush
222 years ( and about 5 months) is the total time in office for the 43 presidents. The first president took office in April of 1789 and the government has been in continuous operation with a President in office ever since that time ,
during the civil war
George Washington was the second time, and John Adams.
The reason why a President of the US is elected to a four year term of office is so that he remains answerable to the voters, who can vote him out of office if the voters do not like the job he is doing. Presidents who have an unlimitted time to lead the government (Presidents for life) become dictators.