Durable Function executes with default timeout ignoring the host.json Timeout setting

Question

I created a very simple Durable function to test the ability of setting a timeout threshold of 60 minutes.

My target framework is .NET 8.0 and I using the Isolated model for my function.

According to everything I've read, I can override the default timeout of 30 minutes by setting it in the host.json file. Mine looks like this:

{
  "version": "2.0",
  "logging": {
    "applicationInsights": {
      "samplingSettings": {
        "isEnabled": true,
        "excludedTypes": "Request"
      },
      "enableLiveMetricsFilters": true
    },
    // Set functionTimeout to "No Limit"
    // Generally not recommended, just in case of infinite loop scenarios
    "functionTimeout": "00:60:00",
    "extensions": {
      "durableTask": {
        "maxConcurrentActivityFunctions": 25,
        "extendedSessionsEnabled": false
      }
    }
  }
}

Everytime I've ran a test scenario that takes more than 30 minutes I receive the following output at the console.

Timeout value of 00:30:00 exceeded by function 'Functions.FunctionName' (Id: '101d29bd-3353-4ff6-89cf-66e1278e88dc'). Initiating cancellation

I am running the tests solely within Visual Studio 2022 in effort of creating a prototype for my company, so I haven't deployed anything to Azure yet.

But my expectation was that if my process runs anywhere between more than 30 but less than 60 minutes, I shouldn't be receiving the default timeout error. Is the only way to fully proof out the timeout setting to deploy it to Azure???

What am I doing wrong?

Manish · Accepted Answer · 2025-06-08 05:18:05Z

You are doing everything correctly, but the problem is that functionTimeout doesn´t work with durable functions.

Source - https://learn.microsoft.com/en-us/answers/questions/1657946/azure-durable-functions-run-only-10-minutes-on-pre

You will have to use Durable function timeout settings. for example

{
  "version": "2.0",
  "extensionBundle": {
    "id": "Microsoft.Azure.Functions.ExtensionBundle",
    "version": "[4.*, 5.0.0)"
  },
  "extensions": {
    "durableTask": {
      "hubName": "YourDurableFunctionsHubName",
      "orchestration": {
        "orchestrationTimeout": "00:30:00"
      }
    }
  },
  "functionTimeout": "00:30:00"
}

More Information - https://learn.microsoft.com/en-us/azure/azure-functions/durable/durable-functions-bindings?tabs=python-v2%2Cin-process%2C2x-durable-functions&pivots=programming-language-csharp#host-json

If though you choose to use durable functions, if you still want to use functionTimeout you can use functionTimeout: -1

{
  //Removed 
  "functionTimeout": "-1" //this will not work with consumption plan.
}

For more about timeout - https://learn.microsoft.com/en-us/azure/azure-functions/functions-scale#timeout

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