I saw a documentary on TV and said it has over 2,500,000 stones weighing up to 5 tons each. That would mean they would have to have placed 1 stone every 14 minutes for 24 hours a day 7 days a week for those 20 years. That dosen't enclude the cosmetic surfacing. Yes, I know the TV and radio antennas were added at a later date.
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Yes, I do- Uh, with certain reservations. First, the building of the structures is much more involved than just counting the stones and resultant 'tonnage' moved. It is a problem of all the national macro-economics of ancient Egypt- at the time of the building process! Essentially, it is a "people" problem more than an engineering problem. I have no problem at all with the engineering of th structures so long as the number of necessary available workers can be fed, housed, cared for, etc for the duration of the project. Many folks think of the stone-stacking problem by itself and that is incorrect. all of the stones could have been quarried, cut, polished, moved and properly stacked in the given time of 20 years. But, the human resources needed were staggering in order to do it. On an engineering basis, the only mystery I have not found a solution for is how did the stones of black granite over the upper chamber get installed? They are massive- some more than 40 tons. Even so, I have developed some solutions- though I consider them impractical for the time- to that problem. Given enough people and some pretty clever, but simple (sublime?), solutions and Giza pyramid certainly could have been built in 20 years with just human muscle and brain power.