The term 'Presidents' Tenures, Perhaps' can be summarized as the length of time a president serves in office. This is usually referred to as an era, which is the four-letter answer to the crossword puzzle. The length of a president's tenure can vary from one to two terms, depending on the country and its laws. In the United States, for example, presidents are limited to two four-year terms. Other countries may have different rules regarding the length of a president's tenure.