What are the aileron lengths of commercial and military aircraft?
This is quite difficult to answer as some modern supersonic fighters  don't have just ailerons, but 'elevons', flaperons, tailerons and most of the time combine the movement of several control surfaces by computer to generate a desired effect.

Large civilian aircraft tend to have more than one pair. A relatively smaller set closer to the wing tips for slower speeds and a general large aileron closer to the wing root.

I would suggest you get a top-view of these aircraft. When you find our the length of the aircraft or wingspan you could derive it yourself through approximation.