The First World War lasted for more than four years (28 July, 1914-11 November, 1918).
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The Civil War lasted four years. From 1861 to 1865.
The war lasted for 18 years it started with the stamp act and it ended with the treaty of Paris
The war lasted 6 years
The civil war lasted about 4 years 1861-1865
it lasted about 50 or 90 years that's how long the Iraq war lasted