It only requires weeks in a normal situation, in an emergency situation you do not use the same process. But who said it was brought down with explosives?
Also as stated it would not take much to bring down a building that is already weakened from fire and debris damage.
Let me guess. Now you're a demolitions expert.
Nobody dreamed of entering a burning building with explosives. NOBODY. The emergency was that the building was likely to collapse. So you deal with the emergency by BLOWING IT UP???? Again and again I ask, do you people actually read what you post? How can you keep a straight face? What possess you to humiliate yourself?