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 its own range, and the studio shows it as duration pills:

• Seedance 2.5 and Wan 3.0: up to 30 seconds (4 to 30, and 2 to 30). The longest takes on the roster.
• Seedance 2.0, 2.0 Fast and 2.0 Mini: 4 to 15 seconds.
• Kling 3.0 and 3.0 Pro: 3 to 15 seconds.
• Hailuo 3 and 3 Max, Motion One: 5 to 15 seconds.
• Motion Pro: 5, 10 or 15 seconds.
• Grok Imagine: 1 to 15 seconds; Runway Gen-4.5: 2 to 10.
• Veo 3.1, Fast and Lite: 4, 6 or 8 seconds.

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

Video is priced per second, at a rate set by the engine and the resolution (and sound, where it costs extra). A few rates at each engine's default settings:

• Seedance 2.0 Mini: 15 credits / second, so 60 credits at 4 s, 75 at 5 s, 150 at 10 s.
• Motion One: 29 credits / second, so 145 at 5 s, 290 at 10 s, 435 at 15 s.
• Seedance 2.0 Fast: 195 at 5 s, 390 at 10 s.
• Kling 3.0: 270 at 5 s, 540 at 10 s, with sound.
• Hailuo 3 Max: 170 at 5 s, 340 at 10 s.
• Seedance 2.5: 490 at 5 s, 980 at 10 s, 1,960 at 20 s.
• Veo 3.1 Fast: 344 credits for 8 seconds with sound.

Seconds do not get cheaper as the clip grows: on Motion One the first five seconds cost 145 and the next five cost 145. Doubling the length 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. You can trim and cut afterwards in the Editor, but a trim only removes: it cannot add the beat the clip never rendered, so what comes back is mostly 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 or four seconds, and four seconds on Seedance 2.0 Mini is 60 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 Cinema is for. You build the film in its Story tab, scenes holding shots (up to 24 shots), and each shot renders on its own, so you are building a sequence rather than gambling on one long render. Each render gives a shot 1 to 4 takes, so you can shoot a beat twice and keep the better one, and you can rewrite or re-render any shot without touching the others. A shot can also "Continue the shot" from the last frame of the one before. The Edit tab cuts the shots into one film, exported as a single MP4.

The same welder idea, stretched across three shots 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 shot, not a longer one. Use them where the beat carries the film. Two takes of shot 2 and one each of shots 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 15 seconds in a single take? Then it is Seedance 2.5 or Wan 3.0, and your plan needs to allow it. If you are on Creator, your real ceiling is 20. Seedance 2.5 against Seedance 2.0 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 shots.
3. Is this a draft or a keeper? Draft at 4 seconds on Seedance 2.0 Mini for 60 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 1 to 30 seconds depending on the engine. Seedance 2.5 and Wan 3.0 go to 30 seconds; most others render up to 15 (the Seedance 2.0 family, Kling, Hailuo, Motion One and Motion Pro, Grok Imagine); Runway stops at 10 and the Veo 3.1 family renders 4, 6 or 8. Your plan caps the ceiling at 10, 15, 20 or 30 seconds.

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

Yes. Motion One is 145 credits for 5 seconds and 290 for 10, and every engine is priced per second, 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. Cinema builds a film of up to 24 shots, each rendered on its own with 1 to 4 takes per render, so a flawed beat costs one shot instead of the whole sequence.

Write one action, pick the shortest duration that finishes it, then build the rest in Cinema: open Cinema.