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Jet fuel, as far as I know, burns at a much higher temperature than say, the usual contents of an office building (carpets, furniture, drywall, paper, etc.)
I can't speak to the duration but the plane that went into the WTC were practically full of fuel. The stories I've read, suggest it was the heat from the fuel (and of course the weight of the building above) that caused the steel in the WTC's girders to eventually buckle.
I also understand that the WTC were designed to withstand plane collisions, but all things combined caused a collapse.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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