Trying to DELETE Publisher, Dropping Subscription Taking A Long Time

USE Published_DB;
EXEC sp_dropsubscription @publication = N'Published_DB_Publication',
@subscriber = N'all',
@destination_db = N'Published_DB',
@article = N'all';

I have a fairly large DB. It is replicating approx 7000 articles. When I run the script above, it's taking a long time (now 1 Hr+). Any ideas what I need to check here?

Adding, I have all REPL jobs disabled and I basically want to remove the DBs being published.

TIA