If the real speed is 0.3 m/s then in the analysis you could set the velocity of a component to be 3 m/s to get a 10x speed increase in the simulation. If the purpose of the analysis was to see 300 mm of motion, then instead of using an End Time of 1 second, you would use an end time of 0.1 second and that would take only 1/10 of the waiting time for the Explicit Dynamics solver to finish than using an End Time of 1 second.