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 If the world population devoted its resources to develop a single supercomputer to crack a single 256-bit key, using round numbers...

2²⁵⁶ possibilities / (

    2³³ people (8B and some change)
    × 2¹⁰ units/person (may be generous)
    × 2⁹ checks/sec per unit (GHz range checkers)
    × 2²⁵ seconds per year (round, only 6% off)

) = 2¹⁸⁹ years

Even if someone developed a method better than brute force, say halving the bits to 128, 2⁶¹ years is still heat-death of the universe