In England typical stud spacing is 16", so 10 studs. Sometimes people use 2' spacing, which would require 7 studs
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You will need at least 13-9' 2x4's, on 16" centers, and 2-16' 2x4's for plates. (Deduct plate thickness from stud length)
Standard studs are spaced 16" apart. 30 feet times 12 inches = 360 inches. 360 inches divided by 16 inches = 22.5. If you are measuring left to right, the right-side stud from the frame becomes the last one. Depending on how you will compensate for the extra 8" at the end, you will need 21 or 22 2x4s.
Two on the top plate and two on the bottom plate. Space them about 3/4" fron the edges.
20x20 = 400 2x4= 8 400/8= 50 needed