The Manhattan Project (or the creation of the first atomic bomb) began in 1942, although it had been discussed as early as 1939. The bombs were esentially part of an arms race against the Nazi scientists. It ended in 1946 a little after we bombed Japan because it wasn't perfect when we used it on Hiroshima and Nagasaki.
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Actual work was begun in the US in 1942 and it was finished in 1945, therefor about 3 years. To assemble the early bombs from a kit in the field took about 3 days with an assembly crew of 40 to 50 men working around the clock.
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