Here is the script I ran:

ALTER DATABASE mytestdb

SET SINGLE_USER;

GO

DBCC CHECKDB ('mytestdb', REPAIR_REBUILD)

WITH EXTENDED_LOGICAL_CHECKS;

GO;

The database has about 7000 tables and around 4GB. AMD Opeteron Proc 6180 SE 2.5 GHz (2 procs)

8.21...