Extreme wait-time when taking a SQL Server database offline

Question

I\'m trying to perform some offline maintenance (dev database restore from live backup) on my dev database, but the \'Take Offline\' command via SQL Server Management Studio is

Answer 1

In my case I had looked at some tables in the DB prior to executing this action. My user account was holding an active connection to this DB in SSMS. Once I disconnected from the server in SSMS (leaving the 'Take database offline' dialog box open) the operation succeeded.