What stats package do you use that gives you a "time spent on site" that's accurate for a single or final pageview (honest question)? Most of them take a very

What stats package do you use that gives you a "time spent on site" that's accurate for a single or final pageview (honest question)? Most of them take a very pessimistic view. I believe Google Analytics counts a single pageview visitor as 0s, for example. That turns out to be terribly inaccurate for my site.