Answer :

Workers at Willow Run, a factory in Michigan during World War II, were involved in the mass production of the B-24 Liberator long-range bombers.

The assembly time for a single B-24 Liberator at Willow Run varied over the course of the war due to improvements in production processes and worker efficiency. Initially, the assembly time for a single B-24 Liberator at Willow Run was around 1,440 man-hours, but this was eventually reduced to approximately 354, and later to 300 man-hours per aircraft. The production time was significantly shortened as the factory and workers became more experienced and efficient.

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