Document 59-minute execution limit for Copilot cloud agent sessions (#60710)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: timrogers <116134+timrogers@users.noreply.github.com>
Co-authored-by: Tim Rogers <timrogers@github.com>
Co-authored-by: hubwriter <hubwriter@github.com>

Author: 3 people

content/copilot/concepts/agents/cloud-agent/about-cloud-agent.md

@@ -148,6 +148,7 @@ You can customize {% data variables.copilot.copilot_cloud_agent %} in a number o
 * **{% data variables.product.prodname_copilot_short %} can only make changes in the repository specified when you start a task**. {% data variables.product.prodname_copilot_short %} cannot make changes across multiple repositories in one run.
 * **By default, {% data variables.product.prodname_copilot_short %} can only access context in the repository specified when you start a task**. The {% data variables.product.prodname_copilot_short %} MCP server is configured by default to allow {% data variables.product.prodname_copilot_short %} to access context (for example issues and historic pull requests) in the repository where it is working. You can, however, configure broader access. See [AUTOTITLE](/copilot/how-tos/use-copilot-agents/cloud-agent/extend-cloud-agent-with-mcp).
 * **{% data variables.product.prodname_copilot_short %} can only work on one branch at a time** and can open exactly one pull request to address each task it is assigned.
+* **Each {% data variables.copilot.copilot_cloud_agent %} session has a maximum execution time of 59 minutes**. This is a hard limit that cannot be extended or bypassed. If a task exceeds this limit, the session will time out and stop. For complex tasks that may require more time, consider breaking the work into smaller, more focused tasks. You can configure a shorter timeout using the `timeout-minutes` setting in your `copilot-setup-steps.yml` file. See [AUTOTITLE](/copilot/how-tos/use-copilot-agents/cloud-agent/customize-the-agent-environment).
 
 ### Limitations in {% data variables.copilot.copilot_cloud_agent %}'s compatibility with other features