Furthermore, the 15 days is itself a bit low---notice in the video that by the time the clock starts, the foundations are already done and some parts of the fir

Furthermore, the 15 days is itself a bit low---notice in the video that by the time the clock starts, the foundations are already done and some parts of the first floor are in; the work continues after the 360:00:00 clock stops; and the last layer of cladding (dark instead of light, which in the finished photos extends to the top) isn't finished past the sixth floor.