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The prevailing conjecture is that a black hole does not have a critical mass. Hypothetically it has been purported that black holes self regulate their growth. This notion is partly considered because in the current span of time for the observable universe to evolve there is no evidence of black holes larger than 3 billion suns, and partly because of expected maximum rotation spin would peak upon the speed of light. [Reference - Constraints on Black Hole Growth, Quasar Lifetimes, and Eddington Ratio Distributions from the SDSS Broad-line Quasar Black Hole Mass Function; The Astrophysical Journal, Volume 719, Issue 2, pp. 1315-1334 (2010).]

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