Ok so if we can download our brains into some kind of system. Could we speed up time in there? What if we could live "one day" in a matter of milliseconds? I i

Ok so if we can download our brains into some kind of system. Could we speed up time in there? What if we could live "one day" in a matter of milliseconds? I imagine a world where we have armies of dead scientists working on tough problems for us, in a simulation or fake world. They could have hundreds of years to figure out solutions. Then report back to use in the real world. All in the matter days. I could imagine some turmoil in this fake world though. Some would want to die or leave. Others wouldn't see the point in helping us in the real world. Fascinating idea.