<P> Since 1947, Pakistan has had nineteen elected prime ministers, aside from the appointed caretaker prime ministers who were only mandate to oversee the system until the process of elections is due finished . In Pakistan's parliamentary system, the Prime Minister is sworn - in by the President and usually is the Chairman or / the President of its party or coalition that has the majority in the National Assembly--the lower house of Pakistan Parliament . </P> <P> After the India's partition on the midnight of 14 / 15 August of 1947, Pakistan followed the British system by having it created the post of the Prime Minister based at the Prime Minister's Secretariat . The Governor - General Muhammad Ali Jinnah, undertaking the advisement from the Founding Fathers of the nation, appointed Liaquat Ali Khan to establish and lead his administration on 15 August 1947 . Before the presidential system in 1960, six prime ministers had served between 1947 until martial law in 1958 . In 1971, the office was again revived but ceased to exist shortly . Executive powers and authority was given to the Prime Minister when the full set of the Constitution of Pakistan was promulgated in 1973 but the post was ceased from its effective operations after another martial law in 1977 . After the general elections held in 1985, the office came to its existence . Between 1988--99, the office was held by Benazir Bhutto of the PPP and Nawaz Sharif of PML (N), each holding the office for two non-consecutive terms between 1988 and 1999: Bhutto during 1988--90 and 1993--96; and Sharif during 1990--93 and 1997--99 . </P> <P> The premiership of the I.I. Chundrigar was the shortest in Pakistan's history, serving only for 55 days into his term . At approximately five years and four months in total, Sharif is the longest - serving Prime Minister . Sharif was re-elected for a third non-consecutive term on 5 June 2013, which is a record in the history of Pakistan . The national politics in Pakistan was mostly dominated by the army department of the Pakistan Armed Forces throughout its history, but it is now dominated by the political parties . </P> <P> After the general elections held in 2002, Zafarullah Khan Jamali was invited to form his administration as its Prime Minister . After the Supreme Court of Pakistan's rulings to disqualified the Prime Minister Yousaf Raza Gillani in 2012, the business of his administration was looked after by Pervez Ashraf until the caretaker administration was setup under Mir Hazar Khoso . </P>

Which pm of pakistan had the shortest tenure