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World war 1 lasted for 4 years (1914-1918).
From 1st September 1939 until 8th May 1945.
World War 1 lasted for about 4 years and 3 months. WW1 started in August of 1914 and ended in November of 1918, however, the last peace treaties were not signed until 1923.
There are too many to enumerate here.... as long as world is there , there would be dates coming up every time....
3 months, between 1 July 1916 till the middle ofNovember 1916