With respect to your 200 years figure, $190M also nets $3.8M/yr investing very conservatively. Even $50M once would usually be valued higher than $1M/yr forever

With respect to your 200 years figure, $190M also nets $3.8M/yr investing very conservatively. Even $50M once would usually be valued higher than $1M/yr forever, in a time-value-of-money sense.