The Chinese construction company Broad Group built a 30-story hotel in just 15 days (360 hours) in December. This time-lapse video shows the process. See another, longer video showing more details at Geekosystem. Link
If you slow down the video you can see a person falling from the building every few days. I wonder how many fatalities happened during the build.
In all seriousness the building was not built in 15 days. It was put together in 15 days. All the parts were build off site. It is just like prefab homes which can be put up in a day or two.
At the haters who think that this building is going to fall down or crumble. If you watched the video carefully it said that the building is engineered to withstand magnitude 9 earthquakes. Get over yourselves and consider the innovation.
In all seriousness the building was not built in 15 days. It was put together in 15 days. All the parts were build off site. It is just like prefab homes which can be put up in a day or two.
http://www.youtube.com/watch?v=pbDeS_mXMnM