FOR HOW LONG DID NOBEL PEACE PRIZE WINNER, INVOLVED IN UNEF ESTABLISHMENT, PRIME MINISTER OF CANADA?
United Nations Emergency Force:  The force was developed in large measure as a result of efforts by UN Secretary-General Dag Hammarskjöld and a Nobel Peace Prize-winning (1957) proposal and effort from Canadian Minister of External Affairs Lester B. Pearson. Lester B. Pearson:  He was the 14th Prime Minister of Canada from 22 April 1963 to 20 April 1968, as the head of two back-to-back Liberal minority governments following elections in 1963 and 1965.
22 April 1963 to 20 April 1968