<page_title> List of G8 leaders </page_title> <section_title> Chronology of longest serving G7 Leaders </section_title> <table> <cell> 6 years, 151 days <col_header> Term Length </col_header> </cell> <cell> Margaret Thatcher <col_header> Person </col_header> </cell> <cell> United Kingdom Prime Minister of the United Kingdom <col_header> Office </col_header> </cell> </table>
The longest period anyone has been the senior G7 leader is the six years, 151 days of Prime Minister of the United Kingdom Margaret Thatcher.