There is this engineering software that after you build our building in 3D, it will tell you how long it will take to build it. I mean, it knows how long takes to build each floor, the quantity of tools you need, the men you need IF you wanted finished by certain date and under certain budged. And entire project management tool.
Sure, and that's assuming the weather is perfect, there are no change orders, supplies are all there...
That is a massive building using probably close to every building trade out there, this will take awhile. Steel goes up fast, concrete can be poured fast, but come finishing time of the interior (flooring, drywall, etc) , this will take awhile to finally be done. Although I'm sure they will finish the 'public' areas first to show it off as soon as they can.