# To speak for a **fixed duration of time**

```{danger}
This feature is not available in all characters! (TBD)
```

```{important}
**Related paramters:**
* max_seconds: Limits the maximum length of synthesized speech. The range of values are `1` to `60`. Default is `30`.
* duration: Define the length of synthesized speech.
* model_version
```

If you want the **input text to be spoken for 20 seconds**, you must request as follows:

```bash
$ curl \
  --request POST \
  --url https://typecast.ai/api/speak \
  --header "Content-Type: application/json" \
  --header "Authorization: Bearer $API_TOKEN" \
  --data '{
    "text": "My name is Typecast.",
    "lang": "auto",
    "actor_id": "${24-letters-your_actor_id}",
    "duration": 20,
    "model_version": "latest"
  }'
```