Going by what was historically available or in the pipeline.
The United States expected to have another atom bomb ready for use in the third week of August 1945, with three more in September and a further three in October. Most likely target for a third bomb would have been Sapporo in Hokkaido.
I'm glad 'how much' a question that never got an answer in this war anyway.
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--Mobilis in Mobili--
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