I'm not personally involved with the discussion moderation program in any way, so can't answer your question directly. However, there is a discussion over in SCN bug reporting relevant to your question that you may find interesting, several different factors are discussed. http://scn.sap.com/thread/3357394 One person with a reputation over 300 reports having their posts delayed by moderation in some areas.
There have been a couple of complaints in the SAP Sybase for Custom Applications area of posts taking up to a week to pass moderation.
-bret