A.Myron Ferguson responds: I often see drywall hung vertically in garages and workshops, which typically have high ceilings and walls longer than 16 feet (the longest available length of drywall). For your job, you could also buy 9-foot-long drywall, and then you wouldn't have any waster.
Another option is to use 54-inch-wide drywall, which is made for horizontal attachment on 9-foot-high walls. It's available only in 12-foot lengths, but this may work out fine if you locate the butt seams above doors or above and below windows. The 54-inch drywall is available in both standard 1/2-inch thickness and 5/8-inch fire-code thickness,...
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