Sir John A. Macdonald was Canada's first Prime Minister. Sir John A. Macdonald served as Canada's prime minister for a total of 18 years and 359 days. He ranks second to the 21 years and 154 days that William Lyon Mackenzie King served as Canada's prime minister.
He served as Prime Minister from 01/01/1901 to 24/09/1903 - a total of 996 days
Margaret Thatcher served as Prime Minister of the United Kingdom for 11 years, from May 4, 1979, to November 28, 1990. This totals approximately 4,260 days in office. She was the longest-serving British prime minister of the 20th century and the first woman to hold the position.
Margaret Thatcher served as Prime Minister of the United Kingdom from May 4, 1979, to November 28, 1990. Her tenure lasted for 11 years and 208 days, making her the longest-serving British prime minister of the 20th century.
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Francis Forde, who was Prime Minister for a mere 8 days, from 6 July 1945 to 13 July 1945.
From 1830 for 3 years and 229 days. So 1830-1834.He was also aged 66 when he became Prime Minister.
Joe Clark was the youngest prime minister of Canada. He was 39 when he took office on June 4, 1979.
Tony Blair became British Prime Minister on May 2nd 1997, four days before his 44th birthday.
John Turner, Canada's 17th prime minister, served as such for only 79 days, from June 30 to September 17, 1984. The only Canadian prime minister to serve a shorter term of office was Charles Tupper (May 1 to July 8, 1896).
Alfred Deakin was the prime minister of Australia three times. He was prime minister from the 5th of September 1903 until the 27th of April 1904. So he was prime minister for 216 days in his first term. He was prime minister from the 5th of July 1905 until the 13th of November 1908. So he was prime minister for 1227 days in his second term. He was prime minister from the 2nd of June 1909 until the 29th of April 1910. So he was prime minister for 331 days in his third term. In total he was prime minister for 1774 days. That is almost 5 years in total.
The longest serving Labor Prime Minister in Australia was Bob Hawke (23rd Prime Minister) who served a total of 8 years, 9 months and 9 days, from 1983 until 1991. All other Labor PMs have served terms under 5 years. The longest serving PM of any party was the Liberal Party's Robert Menzies, who served 16 years, 1 month and 7 days in the 50s and 60s.