Physically this is about a 3 for me, but mentally, especially if you have not done this type of thing, it can be a 7 or 8. You are making your mind do 2 things at once. The idea is to keep the slipping and evasion or the body turns and mechanics going while you do random punches. I recommend doing this one with "5 minute workout: footwork with punches." That would be a nice 10 minute set for you.