I don't know how long it takes to assemble the pieces in the factory,
but the installation time is incredibly fast!
This 30 story Hotel took 15 days to erect. Notice each of the sections
already have electric and plumbing installed and were tested for accuracy,
all prior to them leaving the factory. It appears that those "sections"
formed and pre-tested at the factory, fit together like lego building
blocks. And look at the earthquake resistance level.