I'm talking about the details of the real work. The details of his results are irrelevant since they're built from oversimplified assumptions. I mean the author

I'm talking about the details of the real work. The details of his results are irrelevant since they're built from oversimplified assumptions. I mean the author didn't even include friction in his calculations. Or placing blocks with special shapes in exceptional positions. Or any setbacks, logistics, infrastructure, trial and error, design revisions, human inefficiency, illness, accidents, etc. His calculations just say it probably couldn't have taken less. But more? Just add a few more of those variables that he completely overlooked and the effort easily increases by one order of magnitude. The worst project managers I've met made better assumptions that this author. You make bad assumptions you get bad conclusions. And saying them "with certainty" just makes one sound even more ignorant. Imagine what his calculations would say about La Sagrada Familia. Certainly not 150 years.