Personally, I think that it would not be computationally intense for an AI capable to create past simulations (and also it will create them anyway for some instrumental reasons), so it will be more likely to be less than 1000 years and a small fraction of one star energy. It is based on some ideas about limits of computations and power of human brain, and I think Bostrom had calculations in hist article about simulations.
However, I think that we are morally obliged to resurrect all the dead, as most of the people of past dreamed about some form of life after death. They lived and died for us and for our capability to create advance technology. We will pay the price back.
Personally, I think that it would not be computationally intense for an AI capable to create past simulations (and also it will create them anyway for some instrumental reasons), so it will be more likely to be less than 1000 years and a small fraction of one star energy. It is based on some ideas about limits of computations and power of human brain, and I think Bostrom had calculations in hist article about simulations.
However, I think that we are morally obliged to resurrect all the dead, as most of the people of past dreamed about some form of life after death. They lived and died for us and for our capability to create advance technology. We will pay the price back.