"A lab setup and a 110 story building kind of have different forces working on the structure. Did the NIST truss sag, yes or no?"
Oh yhe of little scientific knowledge!!! I'll answer your question with a YES, however that is not meaningful!
The trusses did sag, but it took (I beleive) 4 hours at extremely HIGH temperatures. Obviously, the buildings were not that hot as there were people standing in the holes! Therfore, the temperature was low and the smoke showed this as well. Thick black smoke signifies a fire being smothered and about to die. The temperature in the building was low, even according to the fire department with their many audio recordings.....
So just because the NIST lab experiement sagged, 3 or 4 hours under EXTREME heat does not mean that the WTC would have sagged sooner. You forget that the trusses were not laying on top of one another, in other words the floors were not stacked on each other to create more stress.
Sorry to burst your bubble, but the NIST data shows otherwise!