Learn how to access Advisor through the Azure portal, get recommendations, and implement recommendations. Azure Advisor automatically runs in the background to find newly created resources. It can take up to 24 hours to provide recommendations on those resources.
You can select a recommendation in Advisor to view additional details – such as the recommendation actions and impacted resources – and to implement the solution to the recommendation.
https://docs.microsoft.com/en-au/azure/advisor/advisor-get-started