Grant Fritchey shows us where we can find long-running queries easily:
Wouldn’t it be great to just quickly and easily take a look at your system to see if you had any queries that ran for a long time, but, without actually doing any work to capture query metrics?
Oh, yeah, I can do that right now, and so can you.
All we need is something that is built into every single server you currently have under management (sorry, not Azure SQL Database) that is SQL Server 2008 or better: system_health
Grant then ties this into general benefits of Extended Events and shows how you can query and view the results.