Duration

Also known as: duration

Duration controls the length of generated video clips in seconds. Shorter durations are faster to generate and cost fewer credits. Longer durations allow for more complex motion and scene development but increase generation time and may reduce per-frame quality.

What It Does

Video generation models produce a fixed number of frames based on the duration and frame rate settings. A 2-second clip at 24 FPS generates 48 frames; a 10-second clip generates 240 frames. The model must maintain temporal coherence across all frames — subjects should move smoothly, lighting should remain consistent, and the scene should evolve naturally.

Longer durations are significantly more demanding on the model. With more frames to generate, there’s more opportunity for temporal artifacts like flickering, morphing, or inconsistent motion. Current video models handle short clips (2–5 seconds) reliably, while longer clips (8–10+ seconds) may show quality degradation. For longer sequences, it’s often better to generate multiple short clips and stitch them together.

Adjusting It in CSF

Duration is a video-model parameter, so you’ll find it on the Video tab. Edit a production design, open its Video tab (available on plans that include video), and click Advanced Settings to open the Advanced Model Settings modal. Pick the video model to configure; duration appears only if that model exposes it.

Depending on the model, it renders as a slider in seconds, a plain number field, or a row of buttons for a fixed set of lengths. Save stores your choice for this design and model when it differs from the default; Reset to Defaults restores it. Many models only allow a small set of durations, so the control reflects exactly what that model supports.

Value Ranges

Short (2–3 seconds)

Quick, high-quality clips. Ideal for reaction shots, loops, and motion tests. Fastest generation and lowest credit cost.

Medium (4–6 seconds)

Room for simple actions and camera moves. Good balance of duration and quality for most storyboard uses.

Long (7–10+ seconds)

Full scene development. Complex actions possible but temporal consistency may degrade. Higher credit cost.

Tips

Start with 2–3 seconds to test your prompt before generating longer clips.
Most storyboard panels only need 2–4 seconds to convey the action.
If a long clip shows flickering or morphing, try breaking it into multiple shorter clips.
Duration works together with FPS to set the total frame count, which drives both generation time and credit cost.