How long did it take Detroit to transform the entire automobile industry into war production?

Detroit's transformation of the automobile industry into war production during World War II was remarkably swift, taking about six months. By early 1942, major automakers like Ford, General Motors, and Chrysler had shifted their manufacturing capabilities to produce military vehicles, aircraft, and munitions. This rapid conversion was facilitated by the War Production Board, which coordinated efforts and prioritized resources for wartime production.