Timeline
Okay, watching Megamind again, yes right now its about the point where Roxanne turns off the watch that "metro man" is wearing and smiles, lol. And I noticed when Megamind slaps Hal into an aparment with a couple eating Chinese food there is a Calender on the wall that reads the month of June. Interesting yes, and then if you QUICKLY pause the very end of the movie with the newspaper reading "Megamind defender of Metro City!" in the right hand lower corner it says "City braces for first winter storm." So... what I can draw from that is thus it probably took about three or four months to build that mueseum, and the brain bots are STILL working on Metro Tower?! Hmm.. IDK maybe first things first was repairing people's homes and the streets torn up by the building. Metro city must have a killer insurance policy.