I am not into flying, but last time I was a passenger I remember that a helicopter engine needs a certain cooldown time after landing which could be around 30 m

I am not into flying, but last time I was a passenger I remember that a helicopter engine needs a certain cooldown time after landing which could be around 30 minutes. In this time the engine needs continue running. My guess is that the electric motors in the Volocopters do not have this requirement. But again, I am not a helicopter specialist.