Thining back I think the fastest racquet I did on my star 5 was about 11 minutes with a graphite mid if I remember correctly. I'm a little quicker on a star 4 though once I get used to the clamps the tension head. That's what I used before the star 5.
4x PT57A Youtek PJ - Unstrung Spec: 331gr 303SW
Luxilon Alu Rough 50lbs - Babolat Star 5