Pikers! Earth Mounds are so easy.
The Great Pyramid is supposed to have been build in about 20 years and it is composed of over 1,000,000 hewn stones weighing 2.5 tons on average—and those savvy Egyptians would have had to have quarried, transported and installed one dressed stone into place every seven seconds.
Eazie Peezie according to Egyptologists.
Of course the ancients moved bigger stones for projects in Baalbeck, Lebanon, Mexico, Puma Puncu in Peru and Stonehenge(s)but for sheer size and stone moving, nothing beats the Pyramids of Egypt.
To think the Egyptians built those things without the help of one Mexican.
The conventional estimate for the number of stones in the Great Pyramid is over 2 million; in the 1990s there was a paper in KMT that made a more meticulous estimate and came up with something north of 5 million (there are many different sizes). A lot of work, regardless — even given that it’s likely that they weren’t quarried per se, but poured like cement.