This is a list of presidents of the United States by time in office...wikipedia - 13 Nov 2020
This is a list of presidents of the United States by time in office. The basis of the list is the difference between dates. The length of a full four-year presidential term of office amounts to 1,461 days (three common years of 365 days plus one leap year of 366 days). If counted by number of calendar days all the figures would be one greater, with the exception of Grover Cleveland, who would receive two days.