50-60 years is far from arbitrary: it's very roughly two generations (plus a bit of extra time, to ensure the process takes). 50-60 years gives enough time for

50-60 years is far from arbitrary: it's very roughly two generations (plus a bit of extra time, to ensure the process takes). 50-60 years gives enough time for a generation to grow up and reach adulthood who have never known anything other than the post-revolution state. Not unrelated: https://blog.gardeviance.org/2015/03/on-pioneers-settlers-town-planners-and.html https://blog.gardeviance.org/2015/03/on-pioneers-settlers-to...