-The timeout duration for functions in a function app is defined by the `functionTimeout` property in the [host.json](../articles/azure-functions/functions-host-json.md#functiontimeout) project file. This property applies specifically to function executions. After the trigger starts function execution, the function needs to return/respond within the timeout duration. For more information, see [Improve Azure Functions performance and reliability](../articles/azure-functions/performance-reliability.md#make-sure-background-tasks-complete), and ensure to [write robust functions](../articles/azure-functions/functions-best-practices.md#write-robust-functions).
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