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3 days: August 6 to August 9.

A third bomb was ready and in San Francisco on August 18 and could probably have been dropped on or about August 25 had the Japanese not signaled on August 14 their intention to surrender.

In total the US had facilities and scheduled production to make 23 atomic bombs and drop them on Japan (only the first 2 were actually used) in 1945. With the war over by September these plans were significantly scaled back and some of the plants shutdown for repairs due to unanticipated problems. This meant that by the end of Operation Crossroads in the summer of 1946 the US had only built a total of 9 atomic bombs, 5 of which had been detonated leaving only 4 in the stockpile.

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11y ago

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