See
http://www.flyertalk.com/forum/Forum39/HTML/002301.html for more information
The "but not inside 30 minutes" is a bit puzzling. If you are a walk on self loading cargo (ie pax with no checked luggage) why not cut of 15 minutes before. The chances of QF selling a vacnt seat in the last 30 minutes prior to departure are slight. 4 hours before they could get a (high $$)paying pax walk up
[This message has been edited by Mwenenzi (edited 10-23-2003).]