Then if you’re running in sequence then it’s a long time to work it out, how many parameters are you changing? What are your variables?
Could just be a once through simulation, it doesn’t have to be an experiment with variables. You could simulate the fluid dynamics of a bike frame in a velodrome, one speed, one air density, one frame, one answer. So if the question has a single answer (how long would it take life on earth to figure out it was in a simulation) then there’s no variable, just a question. Or you could ask the question what is the time dependency of life on earth figuring out it’s a simulation correlated against the atomic weight of hydrogen in each world.
And ‘time’ is relative, the process simulation on my PC reaches a steady state in minutes, in reality if I started up the plant and left it at that it would take weeks to settle down if it didn’t blow up first. Given sufficient processing power you could do the entire universes existence in a blink of an eye.