How about bounce rate comparison?

From a user perspective - I spent more time on the site than I do any other real estate site...because I was trying to figure out where to find things, and it took significantly longer to look at multiple areas than any other site.

I'm not sure time on site is a reasonable measure of success - but I also think 9 minutes is impressive regardless :)

You definitely have me thinking about doing some experimentation in minimalism (we, apparently, service a very similar niche).