In fact the simulation of any timeframe would be constrained by physical laws. For example for a Boltzmann Brain with a similar chemical composition as ours th

In fact the simulation of any timeframe would be constrained by physical laws. For example for a Boltzmann Brain with a similar chemical composition as ours the speed at which chemical reactions occur would limit the speed of experience. For a Boltzmann Brain that simulates ours with a very different physical substrate the speed of light would still be a limit.