雖然施工只用15天, 但前端的預備算在內也不止了.

This 30 story Hotel took just 15 days to build !!! This was erected in 2011 in China.

30 story hotel built in 15 days! The wonders of prefabrication!!!

Notice each of the sections already has the electric wiring and the water pipes and drains all installed and these were tested for accuracy and performance, all prior to them leaving the factory.

It appears like those "sections" formed and pre-tested at the factory, snug together like Lego building blocks.

And look at the earthquake resistance level.

But honestly, we have to take into account the prefabrication time. So it is more than 15 days in all.