>>510945367
>30 years?
yes, and only in the months when you couldn't farm
>With hand tools?
not just with hand tools, but also with pulleys and sleds. They had to transport it too.
>And a society that had barely developed primitive agriculture to sustain itself?
Egypt had by far the most advanced system of agriculture at the time. Primitive is a massive understatement, as they used complex irrigation systems with water lifting techniques.