Such an excellent context to put this in. Even just thinking more broadly about the unimaginably long stretches of relative stability / homogeneity in ancient and prehistoric cultures. The Old / Middle / New Kingdoms (c. 2,700-1,100 BCE), Aurignacian (c. 60,000-24,000 BCE) and Gravettian culture (c. 30,000-15,000 BCE) come to mind but the examples are basically endless.