# Notebook FAQ
URL: https://docs.datarobot.com/en/docs/workbench/wb-notebook/notebook-faq.html

> Answers questions and provides tips for working with DataRobot Notebooks in Workbench.

# Notebook FAQ

## Feature considerations

Review the tables below to learn more about the limitations for DataRobot Notebooks.

### CPU and memory limits

Review the limits below based on the machine size you are using.

| Machine size | CPU limit | Memory limit |
| --- | --- | --- |
| XS | 1 CPU | 4 GB |
| S | 2 CPU | 8 GB |
| M* | 4 CPU | 16 GB |
| L* | 8 CPU | 32 GB |

* M and L machine sizes are available for users depending on their pricing tier (up to M for Enterprise tier users, and up to L for Business Critical tier).

### User limits

You can maintain a maximum of four concurrent active notebook and/or codespace sessions per user in DataRobot. There is also a larger limit for the maximum number of concurrent notebook or codespace sessions that can be running across all users in an organization. If the limit has been reached, you can shut down an existing active session in order to launch another notebook or codespace in a session. Contact your DataRobot representative for more information on the limit for the total number of concurrent sessions that can run in parallel in your organization.

### Cell limits

The table below outlines limits for cell execution time, cell source, and output sizes

| Limit | Value |
| --- | --- |
| Max cell execution time | 24 hours |
| Max cell output size | 10MB |
| Max notebook cells count | 1000 cells |
| Max cell source code size | 2MB |

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