I would suggest a trip to your local commercial drywall supplier, who will be used to dealing with metal framing.
There are lots of variables to this answer besides just the height. Is this wall strictly to hang drywall on or will it support some type of display boards or storage shelves.? How much flexibility are you willing to tolerate? etc.
Design specs even differ from manufacturer to manufacturer of what appears to be the same product to the layman. Non obvious things like small differences in the depth of the return on the stud, and even the shape of the embossing on the metal affect it's strength. They are an engineered product, designed to yield maxinum strength with minimal material usage. Even the old way of refering to them as 20ga is no longer accurate,although still commonly used, as you will see that the thicknness of a 20 ga stud is less than the thickness of a 20ga piece of sheet metal.