Cirque Du Soleil is really well known all over the world and their detail to the craft is zero to none. I’m guessing it would take months maybe years to practice the choreography and even planning the design of the set to suit the choreograph. Not to mention, for some show, they even set up their own huge circus tent.
As you said the planning of this has to take a very long time, especially in comparison to the time of execution. The actors here are probably among the best in their branch, I feel sorry for the one who accidentally ruins the performance.