Hello Nicholas,
You can get the calculated time in the community version by looking at the end of the simulation graph (Settings/Analysis). In the member version you can also access it in Grasshopper via the Analysis component, e.g. for optimization.
If the simulation gets laggy, consider turning off the target frames so that only the toolpath is displayed.
However, take under consideration that KUKA|prc calculates the time based on distance / programmed speed, so it does not take acceleration and deceleration under consideration as those are not published for all robots. Depending on your toolpath this can be either a small or a very big difference. I mostly use the time for relative optimization, i.e. lower time is better, but you couldn't use it to finetune a choreography or something like that.
Best,
Johannes