Few queries will take more time and resources to execute. A long running query or poorly written query might consume a lot of resources and hence block the other resources, This will cause problems in azure model.
SQL Azure now terminates long running queries or transactions or idle transactions which are running more than 5 minutes. Queries which are executing more than 5 minutes will not be executed. This will save the resources. So, while writing a query, keep in mind that it should take less than 5 minutes to execute.