Realism (of a sort)

[Tomgs]

I have converted 3M each of Organic and Radioactive into Minerals on the same turn the question that would be on my mind is how did those 4.2M (6M x 70%) KT get to all of those worlds all around the galaxy so that they could complete their building in a 10th of a year? Instantanious transmission? Putting limits on the resource converter would make sense but the ability to convert resources is already pretty advanced so other abilities could be assumed also.