How long did the empire state building burn for after it was hit by a plane in 1945?

Question

The empire state building was struck by a plane in 1945 (B-25 bomber) although it caused $1 million of damage...it did not collapse...does anyone know for how long it was on fire

Answer 1

one hour

"The 4-alarm fire brought every available piece of fire-fighting apparatus to the scene. As the building was evacuated, firemen spent about an hour extinguishing the flames."

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Answer 2

If you're trying to compare this to the World Trade Center you must realize that the construction of the Empire State Building is much different  than the WTC.

In addition the B-25 is a small twin engined medium bomber with a gross weight of around 35,000 lbs.

The planes that impacted the WTC were Boeing 767's with gross weights pretty close to 10 times that of the B-25. They carried much more fuel and travel much faster.