I don’t know because the World War was over after 3 and a half. It is a question that can never be answered.
That’s odd, WWII started in September 1939 with the invasion of Poland in all the history books I’ve read.
It took the USA a couple of years and a slap in the face from Tojo to wake up and join the fight against fascism the rest of the world was involved in, but the war had been going on for over two years.
September 1939 until June 1945. Two and a bit months short of 6 years by my reckoning. Just a bit short if you include that little unpleasantness in the Pacific.