A yottasecond (Ys) is an SI unit of time representing 10^24 seconds. This duration equates to roughly 31.7 quadrillion years, which is over two million times the current estimated age of the universe. It is a theoretical unit used in speculative physics, cosmology, and discussions regarding proton decay or the ultimate fate of the universe.
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The predicted half-life of certain theoretical particles exceeds one yottasecond.