For those that are constantly reviewing site visitors with Google Analytics (or any web site analyzer), there are a few things you should realize about their measurements.

Avg. Time on Site.
-This is calculated when they first request a page, and then when they request another.  This is not a true indication of the time.  Say if a person wants to read one of your posts (say a really lengthy and informative post, and it fulfills their needs) it doesn’t say actually how long they sat there and read it.  So it counts it as 0 time on your site if they do not click something else on your site.

Bounce Rate:
Many people don’t go to a website to find specific information and while they’re using that information for their intended purpose, do they continue to search your site unless either A) they’re returning to find out what else you wrote or B) complete finished whatever task they needed to accomplish at your site, and was curious about more.

So in conclusion, these are not great indicators of how your site helps people unless you have 20 articles written about similar subjects.  Because there is not a way for them to see (unless the person clicks something after reading the article, which many don’t).  If anyone has a good alternative or way to determine these and other measurements better, please feel free to share with all of us.