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According to ''National Geographic'' it took an estimated 20,000 to 30,000 workers to build the Pyramids at Giza over a period of 80 years from about 2570 to 2490 B.C. and slaves were not used.
Enlarge Photo credit: Â© Ugurhan Betin/iStockphoto. Egyptologists Mark Lehner and Zahi Hawass have been trying to solve the puzzle of where the 20,000 or 30,000 laborers who are thought to have built the Pyramids lived. Ultimately, they hope to learn more about the workforce, their daily lives, and perhaps where they came from.