Area of all windows and doors is subtracted from totals. It would depend on the length of the wall not just height. From what you said I would either stagger the joint.
Or buy 10ft lengths of drywall. Project List Compare. CertainTeed GlasRoc Shaftliner Type X Gypsum Board.
Lead-Lined Sheetrock, Gyproc, Wallboard or Gypsum Board. MarShield drywall is. This way every seam has a finished edge and tapes vertically very easily.
It is designed for direct attachment by screws, nails or adhesive to wood or metal framing and even existing surfaces. USG Sheetrock Brand Mold Tough Gypsum Panels have a noncombustible, fire- and moisture-resistant gypsum core encased in moisture and mold-resistant.