Another question about the use of Atomic Bombs in WW2....

http://www2.gwu.edu/~nsarchiv/NSAEBB/NSAEBB162/72.pdf

Three a month with the possibility of a fourth every other month. Production is estimated to be one every 10 days.

 

I am thinking they would have had a bit of difficulty producing the bombs as they had been a scientific production made up of scientists not much interested in a production line as they viewed themselves as intellectuals attempting to create some new scientific discoveries. Some of these scientists refused to call the new bombs "weapons" as opposed to a "research device" due to how little they had been tested. Administrators knew they would have to switch their research lines into production lines and were in a scramble.......and I might say a somewhat reluctant scramble to go to producing them if you were to see how the success and losses of life affected the researchers that brought the new weapon forward. Even Oppenheimer himself had great reservations about this new development not yet knowing what it would mean for the world. Even the creators carried grave doubts about the new technology. Who can blame them as a door had been opened for even more powerful bombs yet to come.

 

One of the problems in predicting the bomb production is that the Hannaford plants had only been on line for a few months but they were being run at over their nominal capacity. Thus there would be considerable question about what their long term output would be.

Another factor would be how the bombs would actually be used. I have read that some in the military wanted to hold any further ones until Olympic and essentially use them as tactical weapons.

Reading the linked file above I see it addresses just that point.