Question: How many years did the winner of the United Kingdom general election in 1955 serve?

Context paragraphs:
United Kingdom general election, 2001: The United Kingdom general election of 2001 was held on Thursday 7 June 2001, four years after the previous election on 1 May 1997, to elect 659 members to the British House of Commons.  Under the leadership of Tony Blair, the Labour Party was re-elected to serve a second term in government with another landslide victory, returning 413 of the 418 seats won by the party in the previous general election, a net loss of 5 seats, though with significantly lower turnout than before - 59.4%, compared to 71.3% in the previous election.  Tony Blair went on to become the first Labour Prime Minister to serve a consecutive full term in office.  It was dubbed "the quiet landslide" by the media,

United Kingdom general elections overview: The United Kingdom general elections overview is an overview of United Kingdom general election results since 1922.  The 1922 election was the first election in the new United Kingdom of Great Britain and Northern Ireland, after the creation of the Irish Free State removed Southern Ireland from the UK.

Phil Boswell: Philip John Boswell (born 23 July 1963) is a Scottish National Party (SNP) politician.  He was the Member of Parliament (MP) for Coatbridge, Chryston and Bellshill since being elected in the United Kingdom general election, 2015 until he lost to Labour candidate Hugh Gaffney in the United Kingdom General Election, 2017 by 1,586 votes.

United Kingdom general election, 1950: The 1950 United Kingdom general election was the first ever general election to be held after a full term of a Labour government.  The election was held on Thursday 23 February 1950.  Despite polling over 1,500,000 votes more than the Conservatives, and receiving more votes than they had during the 1945 general election, Labour obtained a slim majority of just five seats — a stark contrast to 1945, when they had achieved a comfortable 146-seat majority.  There was a national swing towards the Conservatives, whose performance in terms of popular vote was dramatically better than in 1945, which helps to explain Labour's slim majority.  Labour called another general election in 1951.

Anthony Eden: Robert Anthony Eden, 1st Earl of Avon, (12 June 1897 – 14 January 1977) was a British Conservative politician who served three periods as Foreign Secretary and then a relatively brief term as Prime Minister of the United Kingdom from 1955 to 1957.

United Kingdom general election debates, 2010: The United Kingdom general election debates of 2010 consisted of a series of three leaders' debates between the leaders of the three main parties contesting the 2010 United Kingdom general election: Gordon Brown, Prime Minister and leader of the Labour Party; David Cameron, Leader of the Opposition and Conservative Party; and Nick Clegg, leader of the third largest political party in the UK, the Liberal Democrats.  They were the first such debates to be broadcast live in the run-up to a UK election.

John Hensleigh Allen: John Hensleigh Allen (29 August 1769 – 12 April 1843) was the Whig member of parliament for Pembroke elected at the United Kingdom general election, 1818 until the United Kingdom general election, 1826.

Bob Russell (British politician): Sir Robert Edward Russell (born 31 March 1946) is a former Liberal Democrat politician in the United Kingdom who was the Member of Parliament for Colchester from 1997 to 2015.  He was first elected at the United Kingdom general election, 1997 and won subsequent re-election in 2001, 2005 and 2010; he was defeated in United Kingdom general election, 2015 by the Conservative candidate and current Colchester MP Will Quince.

George Murnaghan: George Murnaghan (4 July 1847 – 13 January 1929) was an Irish Nationalist Member of Parliament in the Parliament of the United Kingdom.  He represented the Mid Tyrone constituency from the United Kingdom general election, 1895, until the United Kingdom general election, January 1910.

United Kingdom general election, 1955: The 1955 United Kingdom general election was held on 26 May 1955, four years after the previous general election.  It resulted in a substantially increased majority of 60 for the Conservative government under new leader and prime minister Sir Anthony Eden against the Labour Party, then in their twentieth year of leadership by Clement Attlee.

Supporting paragraphs: United Kingdom general election, 1955 Anthony Eden
Answer: 1955 to 1957