Pattern Flying?
PaPa-NeGeorgeo,
There is no fastest time that is awarded in pattern. The only flight time limit that I am aware of is 10 minutes for all of the maneuvers from takeoff to touchdown. And pattern is precision aerobatics, so a trainer wouldn't be too feasible to fly unless you are flying a semi-semmetrical airplane in Sportsman class. In F3A though, you definately wouldn't get away with it.
I saw on your profile that you have a Sig 4 Star 40. That would be an acceptable airplane to fly for the lower classes if it was adequately powered.