The timelines are pretty well-established. https://www.ancient.eu/timeline/pyramid/ https://www.ancient.eu/timeline/pyramid/ It did take decades of years for p

The timelines are pretty well-established. https://www.ancient.eu/timeline/pyramid/ https://www.ancient.eu/timeline/pyramid/ It did take decades of years for pyramid-building to improve (possibly longer), but the date of the Great Pyramids is known with pretty high confidence and aligns with particular dynasties and rulers. The big ambiguity is around the actual techniques that were used to transport the material and build the pyramids, not around the timeline.