You can set how often you receive emails about long-running jobs and workspaces. This lets you shut them down when they are no longer needed.
In the navigation pane, click your username.
Go to Notifications and in the Jobs & Workspace Sessions, select the Notify me about long-running Jobs and Workspace sessions checkobox.
Select the time from the list.
When you receive an email, it will include the number of sessions, links to the sessions, how long they have been running, how long you have before they are automatically shut down (if applicable), and links to shut them down.