I think 40 minutes would be quick. However, if you're seeing a clinician you're comfortable with and have a good rapport with and trust as someone working for your benefit and are therefore willing to tell them about traumatic things that most people would be afraid to talk about, yes, the clinician could make that diagnosis within the confines of those 40 minutes, if they asked enough questions.
On November 25th, 2010. See this statement in context.