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he served two separate terms as the country's prime minister
Many times
6 times
onec
Prime Ministers can normally be elected any number of times.
87 times, probably not
Harold Wilson was prime minister of the United Kingdom from 1964 to 1970 and from 1974 to 1976.
twice
Twice
one time
Stephen Harper became the Prime Minister once in 2006. He has continued to be re-elected in 2008, with an election pending in 2011. So far he has not had to resign as Prime Minister.