The most common length for a modern horsehair sporran appears to be 18" from the top of the orb (the decorative ball thing at the top of the cantle) to the bottom edge of the hair. Sporrans made for children, of course, will be shorter than this. Sporrans from earlier periods were often significantly longer. As others have mentioned, the height at which the bottom edge of the sporran sits on the kilt is determined largely by the height of the wearer.
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