Maybe I'm misinterpreting something, but the way I understand it, the last (or only) page of a website is handled differently. If it's a single page website with a demo download, and someone downloads the demo, then the time between pageload and the download would be counted. If there's a Flash movie, the time between loading the page and playing the movie would be counted. It also looks like you can come up with your own custom events to track, maybe like clicking an outgoing link?

I've never seriously used GA so take my interpretation with a basketball-sized grain of salt.

I`ve read that doc, and it looks like you are right. Now i`m even more courious how they measure single hit reading time.

What is your pages per visit number?

Before changing the site to a multiple page site, I was averaging 1.2 pages/visit. Again with a 1 page site, but I would develop on the server so I figured GA was picking that up. Since changing to a multiple page site my pages/vist is 2.55 and my average time on site has increased by like 20 seconds, which seems a lot. Maybe people are on 56k, haha.