5 tons to 50 tons. The total weight of the Pyramid of Cheops exceeds six million tons. Herodotus, the Greek historian claims "it took 100,000 men working in three shifts twenty years to build this massive structure." This statement is a cause for much debate among experts. Mark Lehner and Zahi Hawass conducted several scientific experiments and came to the conclusion that it only took 20 to 30,000 men to build the Pyramid of Cheops. Lehner and Hawass do think it would have taken those 20 to 30,000 men about thirty years to complete the project. In one of the test, NOVA attempted to build a replica pyramid and test particular techniques and tools without testing the entire building project. "Twelve men in bare feet living in a lean-to shelter for twenty-one days quarried 186 stones with the use of iron tools and an iron winch." .
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Of course iron tools were not present in the time that this pyramid was built so Lehner replaced the tools with an additional 20 men. Therefore a mere 1200 men could keep up the pace of quarrying 340 stones a day. It is believed that the pyramid could have been built in thirty years at this pace. This number does not include the laborers that prepared the stones to be laid. When these numbers are multiplied by twenty years time, the conclusion can be made that it took way less than Herodotus" first estimate of 100,000 men. The most debated question concerning the pyramids simply asks who built them. The vast majority of respected experts believe humans built the pyramids. However there are others that claim even though the pyramids were built on Earth, humans did not build them. .
According to Mystic Places Time Life Books there are many cases involving the solar system that can only be explained by the belief that extra terrestrials built the pyramids of Egypt. For example, one photograph in particular was taken on the evening of the summer of solice.