I came across a story about a company in China planning on building a 220 story building, which would be the tallest in the world, in 90 days. That would be at the rate of 5 floors per day. They’re using pre-fab modular units, and not counting the time it takes to construct those, just the actual time on site.
I know how much time and coordination it takes just to build a three story building, and what kind of mistakes happen that have to be corrected along the way. If they meet their deadline, there’s not enough money in the world that would get me to go into that building!