> For the complete documentation index, see [llms.txt](https://docs.n8n.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.n8n.io/deploy/host-n8n/configure-n8n/basic-configuration/use-environment-variables/workflow-history.md).

# Workflow history

| Variable                          | Type   | Default | Description                                                                                                                              |
| --------------------------------- | ------ | ------- | ---------------------------------------------------------------------------------------------------------------------------------------- |
| `N8N_WORKFLOW_HISTORY_PRUNE_TIME` | Number | `-1`    | How long to keep workflow history versions before automatically deleting them (in hours). Set to `-1` to keep all versions indefinitely. |