I would say that it is not possible.
The time taken to cut a job depends highly on the job itself. If everything is vector cuts, then the job will go very quickly. If you have a bunch of Raster engraves, it will take a long time.
If you are cutting a single continuous line, the job will be very quick. If you are cutting many small individual parts which are spread around the work material, and you did not optimize your tool-path motion, the job will take ages.
Further… what you need in order to cut a material is a specific amount of energy. That energy is determined by the amount of time spent on location and the setting of the laser. So at one speed you can cut your thin material with 10% power, but at a higher speed you can only cut the material with 70% power, and at some speed you barely manage to cut while using 100% power.
Why do you choose specific speed/power settings? Level of detail, and end result of laser after-effects on the material. If you actually WANT to have a burn mark around the cuts or engraves, you should probably move slow. If you will be turning lots of corners rapidly, you REALLY want to move slow. The edge finish on certain plastics may be terrible at half speed full power, but phenomenal at half power full speed…