"Worst-case scenario would require 0.5 seconds per floor for collapse"

This shows that our 'Fiscis Majer' is gonna fail... except in Mental Masturbation 101... and destroys any credibility of the 'expert source' quoted...

Things fall, not with a 'speed' or velocity to use real Physics Jargon, but with an 'acceleration'. This means that each subsequent falling floor would 'fall in a different period of time'... each one shorter than the one before...

Back to the tinfoil hat mate...