# Limits – Realtime

Learn about the limits for the Speechmatics Realtime API

Speechmatics limits the number of concurrent Realtime sessions by account type. The current limits are listed in the table below:

|            | Max. concurrent sessions |
| ---------- | ------------------------ |
| Free       | 2                        |
| Pro        | 50                       |
| Enterprise | Custom                   |

Please reach out to [Support](https://support.speechmatics.com) if you need to increase the above limits.

### Session limits[​](#session-limits "Direct link to Session limits")

Realtime SaaS sessions will be automatically ended if any of the following criteria are met:

* Session duration reaches 48 hours
* No audio data (AddAudio messages) sent for 1 hour
* No audio or ping/pongs sent for 3 minutes.

When a session is automatically ended, the Realtime SaaS service will send an in-band error followed by a closing handshake with code `1008`. For more information, see the [Realtime API Reference](/api-ref/realtime-transcription-websocket.md#error).

### Guidance for users[​](#guidance-for-users "Direct link to Guidance for users")

Clients can disconnect a session before it is automatically terminated and immediately reconnect a new session. Note that new sessions will typically start in less than a second. If seamless transition is required, the new session can be connected a few seconds before disconnecting the old session.

Since unpredictable network issues can cause WebSocket connections to be dropped, we recommend graceful handling of session termination for long-running sessions.

## Custom dictionary limits[​](#custom-dictionary-limits "Direct link to Custom dictionary limits")

If a session's custom dictionary (`additional_vocab`) contains more than 20,000 items, the Realtime SaaS service sends an in-band error message of type [`protocol_error`](/api-ref/realtime-transcription-websocket.md#error) and closes the WebSocket connection with code `1003`. See [Custom dictionary content limits](/speech-to-text/features/custom-dictionary.md#maximum-number-of-custom-dictionary-items) for details.

## Data retention limits[​](#data-retention-limits "Direct link to Data retention limits")

Speechmatics Realtime SaaS does not store audio files, transcripts, or configuration data.