Thanks for posting your question in the Microsoft Q&A forum.
Best for long-running scenarios where Durable Functions can't be used. Consider an App Service plan in the following situations: ✔ You have existing, underutilized VMs that are already running other App Service instances. ✔ Predictive scaling and costs are required.
https://learn.microsoft.com/en-us/azure/azure-functions/dedicated-plan
And based on runtime/Storage/Data Transfer you can find cost per month
May this article help you:
https://azure.microsoft.com/en-ca/pricing/details/app-service/windows/
** Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful **