[quote=Heroic]
The total size of the city in miles compared to the number of drones he had, each of which move very, very quickly. He had way more than one to cover each square mile of space, and each built a respective area. The resources come from a long amount of time spent mining uninhabited planets and stockpiling for a big project, and the city was that project. Yes, I believe that it was entirely feasible.
[/quote]

Then the number of bots had to be astronomically high. Given the numbers, this was an impossible task to compete in a month.