I wouldn't be too sure about that mate; I hade mine December 09 and as I said, started 8:30 and finished at 5!
Ouch. I guess it really depends on location. Worked at DFR for a few months and they recorded times that people were in the building in order to determine the averages. Was pretty good at our location but I suppose it all depends on which recruitment centre you're at.
Although the Dr's and psych usually don't get too busy there are only x amount of defence interviewers in the building and they can get back logged pretty easily. Alot of reporting goes into the interviews and they have to prepare for each candidate on a case by case basis. Ends up taking alot of time but I guess you don't really need to know the inner workings of recruiting. Just know that although its slow... It does work.