Theoretically - they change every time there is a General election. However - So long as their party is re-elected, and they don't resign their seat as an MP, If they're still the party leader, and their party is re-elected at a General election - they could be Prime minister for many years.
five
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prime minsters are like king and queens and presidents.
Antonis Samaras
In 1914. Serbian prime minister was Nikola Pasic from National Radical party.
As you do not state which country this question cannot be answered
No. The former UK prime ministers' sister-in-laws has said she is embracing Islam. She may change her mind.
This is a trick question - there were no prime minsters of Australia in the 1800's. indeed Australia did not have a prime minsiter, as federation did not occur till 1901. therefore, the first prime minister came to power in 1901 - that being Sir Edmund barton.
The first Prime minister of Canada was Sir John A. Macdonald and the recent was Stephen Harper. The Prime minister of Canada is also the minister of the crown, chairman of the cabinet and the head of government for Canada.
the prime mister of the UK is David Cameron
Medieval kings had the final say when it came to making their decisions, and did not have be held accountable to anyone. Prime Minsters have to answer to parliament, and cannot pass decisions at their whims and fancies.
The current Prime Minister of the UK is David Cameron. Every Thursday, the Queen of the UK meets the Prime Minister.