A period of Five years.
Since 2007
Since 2006
Prime Minister Stephen Harper has been Prime Minister of Canada since 2006 February 6, more than 5 years.
Charles Tupper was Prime Minister for only 69 days
The current Prime Minister, Recep Tayyip Erdogan, has been in power since 2002. In Turkey, a Prime Minister can remain Prime Minister as long as his party or coalition maintains over 50% keeps nominating him as the Prime Minister.
The Prime Minister serves as long as his party is in power, whether it be as a single party or as part of a coalition. The Prime Minister stops serving when they step down, or he loses the ability to lead the government.
First Prime Minister of Pakistan Mr. Khan Liaquat Ali Khan.
Nothing is named after the prime minister because she wasn't a prime minister long enough.
The minister who started Providence, Rhode Island was Roger Williams.
Hailemariam Desalegn is the Prime Minister of Ethiopia in 2013.Haliemariam became acting prime minister on 2012 August 20, officially becoming prime minister on Sept 21. He replaced long time Prime Minister Meles Zenawi Asres whom died in office.
Hun Sen has been Prime Minister of Cambodia since 1988 November 30, almost 23 years.
As long as he's not married.