How long would the pyramids take to build with modern methods?

Pictured below is the Giza Complex. This answer will attempt to find the minimum length of time to construct the Complex, depending on three interpretations of "modern methods" regarding the final product design. read more

2.5 million cubic meters of limestone were used to construct the Great Pyramid over 20 years. That's 342.46 m^3 / day. Compare to modern construction methods: 16 million cubic meters of concrete were used to construct the Three Gorges Dam over 17 years. That's 2,579 m^3 / day. That's about 7.5 times faster, so there's a preliminary answer for you. read more