8.
It was a beast and I went through blades lickity split. I was careful to keep the shape cut from sliding, made several passes until I couldn't hear the fabric cut anymore. Still had to snip some threads with the scizzor tip.
4 wasn't real bad and I prefer 2.
I have to depend on my shape cut because I tend to let a long edge ruler slide when I am making the pass and I tend to rub the ruler with the rotary blade, ruining the blade and ruler.