AI video clip length guide — from 3 seconds to 30 seconds

Length is the second thing you pick in the video studio and the first thing that goes wrong. People reach for the longest clip their plan allows, get back ten seconds of a subject doing one thing for two seconds and then drifting for eight, and conclude the engine is weak. Usually the engine was fine and the duration was a request for eight seconds of nothing in particular. Here is how the grids actually work, what each extra second costs, and when the answer is a storyboard rather than a longer clip.

Three limits, not one

Every clip length on eroq is the result of three constraints stacked on top of each other.

1. The engine's grid. Each engine renders specific durations, not a free slider:

• Seedance 2.5 — 4 to 30 seconds. The only engine on the roster that goes past 12.
• Seedance 1.0 Pro — 3 to 12 seconds, any value.
• Seedance 1.0 Lite — 3 to 12 seconds, any value.
• Motion One — 5 or 10 seconds.
• Kling 2.5 Turbo — 5 or 10 seconds.
• Hailuo 02 — 6 or 10 seconds.
• Veo 3 Fast — exactly 8 seconds, fixed. It is the engine that renders its own sound, and its length comes with it.

2. Your plan's ceiling. Whatever the engine can do, the account caps it: 10 seconds on free, 15 on Hobby, 20 on Creator, 30 on Studio, Team and Agency. So Seedance 2.5 can render 30 seconds, but on Creator that same engine tops out at 20. Plans are on /pricing.

3. What the shot can hold. The real one. More on that below.

What longer actually costs

Credits scale with duration, and close to linearly. The rates at the published anchors:

• Seedance 1.0 Lite — 40 credits at 3 s, 60 at 5 s, 90 at 8 s, 110 at 10 s. Almost exactly 10 credits a second, all the way up.
• Seedance 1.0 Pro — 90 at 3 s, 140 at 5 s, 210 at 8 s, 260 at 10 s.
• Motion One — 100 at 5 s, 180 at 10 s.
• Kling 2.5 Turbo — 120 at 5 s, 220 at 10 s.
• Hailuo 02 — 100 at the 5-second anchor, 180 at 10 s.
• Seedance 2.5 — 180 at 5 s, 340 at 10 s.
• Veo 3 Fast — 256 credits for its fixed 8 seconds.

Seconds do get marginally cheaper as the clip grows — on Motion One the first five seconds cost 100 and the next five cost 80 — but nowhere near cheap enough to be free. Doubling the length roughly doubles the bill.

Which produces the only budgeting rule that matters here: a bad second costs the same as a good one. Ten seconds where the last six drift is not a cheap ten-second clip, it is an expensive four-second clip. Failed renders refund themselves automatically; a render that succeeds and is boring does not.

One action per clip

Generated clips are single takes. The engine does not cut, and eroq has no editing surface — no trimming, no transitions — so whatever comes back is what you keep or re-render. That makes the practical unit of a prompt one action.

A good five-second clip contains one of these and nothing else:

• a subject completing one movement — standing, turning, reaching, landing;
• one camera move across a static scene — a push-in, an orbit, a slow pan;
• one change of state — a light coming on, rain starting, a door opening.

A five-second clip that contains three of those is a clip where each gets 1.7 seconds and none of them reads.

So when should you go long? When the single action genuinely takes that long. A crane up across a city skyline needs room. A slow orbit around a car needs room. A person turning their head does not — that is three seconds, and three seconds on Seedance 1.0 Lite is 40 credits.

Here is a prompt written honestly for its length. One action, one camera move, five seconds:

A welder tips her helmet back with one gloved hand and looks straight down the lens, sparks still falling behind her from the frame she was cutting, the shop dark except for the blue afterglow on her face. Slow push-in from a medium shot, 35mm film, contre-jour spill, industrial fog palette, tense and still.

Nothing in that paragraph asks for a second action. It asks for one gesture and one camera move, and it will read cleanly at five seconds on any engine on the roster.

When to storyboard instead of stretching

If your idea has a beginning, a middle and an end, it is not a long clip. It is three clips.

That is what Film mode in the video studio is for. You add scenes one at a time — up to 12 — and each renders immediately, so you are building a sequence rather than gambling on one long render. Each scene supports 1 to 4 takes, so you can shoot a beat twice and keep the better one, and you can edit, re-render, reorder or duplicate any scene without touching the others. The result plays back as an assembled piece, and drafts save as "My films".

The same welder idea, stretched across three scenes instead of one long take:

1. Sparks in the dark, five seconds. Static wide, the frame being cut, nobody's face visible.
2. The helmet goes back, five seconds. The prompt above.
3. She turns away and the light dies, five seconds. Slow pull-back, the shop going black.

Fifteen seconds of actual film, built from three clips that each do one thing, at three times the five-second price rather than one inflated thirty-second gamble — and every beat individually re-renderable. Compare that to a single 15-second render where a flaw at second 11 costs you the whole clip.

A note on takes: a take is another roll of the same scene, not a longer one. Use them where the beat carries the film. Two takes of scene 2 and one each of scenes 1 and 3 is a sensible distribution.

The API version of this is films — post a storyboard, render every scene in one call — and the studio-side walkthrough is on the AI film maker page.

Picking a length in three questions

1. Does the clip need more than 12 seconds in a single take? Then it is Seedance 2.5, and your plan needs to allow it. If you are on Creator, your real ceiling is 20. A side-by-side with the older Pro is on /compare/seedance-2-5-vs-seedance-1-pro.
2. Does the shot contain exactly one action? If yes, pick the shortest duration that lets it finish. If no, split it into scenes.
3. Is this a draft or a keeper? Draft at 3 seconds on Lite for 40 credits. You are checking motion and framing, and both are visible almost immediately.

FAQ

How long can an AI video clip be on eroq?

From 3 to 30 seconds depending on the engine. Seedance 2.5 renders 4 to 30 seconds; the Seedance 1.0 engines do 3 to 12; Motion One and Kling do 5 or 10; Hailuo 02 does 6 or 10; Veo 3 Fast is fixed at 8. Your plan caps the ceiling at 10, 15, 20 or 30 seconds.

Does a 10-second clip cost twice a 5-second clip?

Almost. Seconds get slightly cheaper at the margin — Motion One is 100 credits for 5 seconds and 180 for 10 — but the bill still scales close to linearly, so length is a real budget decision.

Should I render one long clip or several short ones?

Several short ones, unless the shot is a single continuous action. Film mode builds up to 12 scenes, each rendered on its own with 1 to 4 takes, so a flawed beat costs one scene instead of the whole sequence.

Write one action, pick the shortest duration that finishes it, then build the rest in Film mode — open the video studio.