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The maximum recommended spacing for 5/8 inch drywall installed on a wall is 24 inches. This spacing is specified to ensure the drywall is adequately supported to prevent sagging or cracking over time. Drywall's structural integrity and ability to resist stresses depend significantly on how well it is anchored to the framing behind it.

When installed at a spacing greater than 24 inches, particularly with heavier drywall like 5/8 inch, there is an increased risk of structural failure due to insufficient support. In interior applications, adhering to this spacing fits within standard building codes and best practices, ensuring that the drywall performs well under normal conditions.

Other options suggest spacings that are either too tight or too wide for optimal support, potentially leading to issues with the durability and finish of the drywall after installation.