The long-term ramifications of a guaranteed $25M/yr for that amount of years could start science labs, schools, provide free education for a small country for 2

The long-term ramifications of a guaranteed $25M/yr for that amount of years could start science labs, schools, provide free education for a small country for 2 generations.. although you may find you could do OK spending the 2-3% interest on $250M, say $500,000 a year, and have that for many more years to come (assuming you only needed 50M to live on after taxes and banking systems stay afloat).