Clip Length Ceiling

Text-to-video tools in this category render in bounded bursts: MiniMax H3 outputs 4 to 15 second clips, and AIProductAds caps 2K output at 15 seconds. That ceiling is not a limitation to work around, it is the unit of account for agency scoping. Any client deliverable longer than a single render is assembled from multiple clips, which means continuity, pacing, and audio mixing revert to human editors. The framework says: price the render, then price the assembly separately, because the second number is where margin lives. A 30 second social cutdown from a 15 second ceiling needs at least two renders plus a stitch pass, and a 90 second explainer needs six or more. Agencies that quote a flat per-video rate against a 15 second ceiling absorb the assembly labor silently. Quote in render units, disclose the assembly line item, and the retainer survives the first revision cycle.