Why are the shut down times so various

why are the shut down times so various

Then again, it could be completely abnormal.
I found that after updating to 10.8.2, from 10.8.1, that my shutdown times went from a solid 3-4 seconds, to a wide array. For the most part, it takes an average of 14-20 seconds on 10.8.2 (with an rare occasional 3-4 second shutdown).
I have performed an erasure, and restore to 10.8.1 to alleviate it (kinda bummed, because I do like some of the new features of 10.8.2).
I then cloned the 10.8.1 install to an external Thunderbolt SSD, and then updated that drive to 10.8.2. Shutdown problem is then evident on that drive (even in safe mode, with no startup items running).
After looking at the console logs, there appears to be a OS component that is hanging. Hopefully 10.8.3 will address it, as I find many others are seeing the same thing (as well as the hanging OS component in their system log).

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