Some pre-1998 calculations, using outdated assumptions about neutrinos, were as follows: If black holes evaporate under Hawking radiation, a solar mass black hole will evaporate over 1064 years which is vastly longer than the age of the universe.See page 596: table 1 and the "black hole decay" section and previous sentence on that page in A supermassive black hole with a mass of 1011 (100 billion) will evaporate in around . Some monster black holes in the universe are predicted to continue to grow up to perhaps 1014 during the collapse of superclusters of galaxies. Even these would evaporate over a timescale of up to 2 × 10106 years. Post-1998 science modifies these results slightly; for example, the modern estimate of a solar-mass black hole lifetime is 1067 years.
Some pre-1998 calculations using outdated assumptions about neutrinos were as follows If black holes evaporate under Hawking radiation a solar mass black hole will evaporate over 1064 years which is vastly longer than the age of the universeSee page 596 table 1 and the "black hole decay" section and previous sentence on that page in A supermassive black hole with a mass of 1011 (100 billion) will evaporate in around  Some monster black holes in the universe are predicted to continue to grow up to perhaps 1014 during the collapse of superclusters of galaxies Even these would evaporate over a timescale of up to 2 × 10106 years Post-1998 science modifies these results slightly; for example the modern estimate of a solar-mass black hole lifetime is 1067 years