It lasted 4 years and 3 months.
four
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September 1939 to August 1945.
they said it would last 4 years
2 years
World War One started on 28th July 1914 and ended on 11th November 1918 - so it lasted roughly 4 years.World War Two was from 1939 to 1945 - so 6 years.
There has been no World war 3. So the answer is 0...