Done Familiarisation flights in Fokkers [and others]. Depends on a lot of factors.... Imagine my surprise on an A300 at Malta... "This will be a flapless t/o. V1 xx,VR xx, V2 xx20 etc. Runway, Climb gradient, Temperature etc WILL be a factor. At the end of the day. the Guys and Gals at the pointy end [really] DO know what they are doing