>>79443050 billion years is an extreme lowball. The last atom free of a black hole will degenerate into radiation 10^(10^76) years from now. The trillions upon trillions of years where any life as we know it will be even remotely possible is just 0.000000000000000000000000000000000000000000000000000000000000000000000000000000000001% of the time between the beginning of the universe and the last black hole evaporating. Next to us the universe may as well be infinite and eternal.