How long was the blast of the bomb fat man?

The "Fat Man" atomic bomb, dropped on Nagasaki on August 9, 1945, produced a blast that lasted only a fraction of a second, with the most intense effects occurring within approximately 0.1 to 0.2 seconds after detonation. The bomb's explosion generated a powerful shockwave and heat, resulting in widespread destruction and significant loss of life. The immediate impact zone experienced catastrophic damage, while the effects of radiation continued to affect survivors long after the initial blast.