# Shapes, lengths and limits

What a film can be today, and what each one uses.

|  | Today |
| --- | --- |
| Shapes | 9:16 (the default), 1:1, 4:5 or 16:9 |
| Lengths | 15, 30, 60 or 90 seconds |
| Prompt | Up to 2000 characters |
| Footage | Video, image and audio files, in up to 5 batches |
| Time | About 35 to 55 minutes for a 30 second film |
| Cost | Nothing from Studio; your connected AI bills as it always does |

## What a film uses

The director's work runs on the AI you connect: a long session of writing, drawing code and checking frames. On a Claude or ChatGPT plan it counts toward that plan's usage; on an API key the provider bills the tokens.

## When a film stops

If the connected AI refuses or runs out, the film room says so and keeps what was asked, so Change it and try again starts from the same words.

Canonical page: https://surfstudio.app/docs/limits