Answer
Labor to repair drywall seams cannot be priced accurately from seam length alone. The work depends on whether the tape is loose, compound has cracked, the joint is uneven, the drywall is moving, or a previous repair must be removed before the seam can be rebuilt.
A typical repair may include removing unstable material, securing the surface where appropriate, applying new tape, placing multiple joint-compound coats, allowing drying time, sanding, matching texture, priming, and painting if included. The finish area is usually wider than the visible crack because compound must be feathered into the surrounding surface. Recurring cracks may indicate movement or another underlying condition that should be considered before cosmetic repair. Westpeak can inspect the condition and provide a written scope for drywall seam repair and finishing.