The other thing with this estimate in the simulator is that the "idle" time which is when the laser is not firing is calculated on the basis of the "work" rate and if there is a lot of white space it can grossly overestimate. For example, we were doing a few small cuts in a large sheet of acrylic and the travel time between them was grossly overestimated based on a speed of something like 10mm/s which means it thinks it needs a few minutes to cross the table. So I go off the work time and add a bit for white space.