I love the phrase, "Vulnerability to Interruptions." It encapsulates a world of experiences.
WRT, with a shorter timeline, I think that's one of the reasons for the success of the short, intensive FTF sessions that are also a part of our program. The shorter time means less opportunity for interruptions. Because we move to a relatively neutral site (still in Nunavut) we also remove ourselves physically from the sources of many of the interruptions without being away too long.
I'd be interested in hearing how your shorter courses do as well. One of the potential dangers is that the shorter the course, the less the time for processing and assimilating new ideas.