WWI lasted about four years, 1914-1918, generally, with the US entering the war in 1917.
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World war 1 lasted for 4 years (1914-1918).
Historians have agreed the dates of 1 September 1939 until 2 September 1945 ie6 years and 1 day, although fighting was taking place before that date.
Well firstly two World Wars have taken place so far, World War I and World War II. World War I was from 1914 through to 1919. World War II lasted from 1939 to 1945.
2 and a half years
In the UK, primary school started at 5 years old during WWII. Is that what you were asking?