Found this post trolling around on KI
Can Guillotine really double-attack more than once? h2h and dual-weild WS being able to also DA on the offhand aside, no other WS has this property that I'm aware of.I've had around 11 or so 7-hit now, but still no 8-hit. Numbers definitely justify the double attacks though..
http://img209.imageshack.us/img209/1777/lolguillqr0.jpg
Someone on that thread also put up some math that says an astonishing 10% of drk/war+brutal guillos should be 6 hits or greater. So it should be easily testable.
XI Wiki

