How long did the conflict known as the great war last?

The Great War is another name for World War I and it lasted for 4 years, 3 months and 2 weeks

World War I (WWI or WW1), also known as the First World War, the Great War, or the War to End ... Within weeks the major powers were at war, and the conflict soon spread around the world ... While these agreements did not formally ally Britain with France or Russia, they made British entry into any future conflict involving ...