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As I said, I use Google Web History. Every link I click is logged to Google. They can figure out how much time I spent on each page from that.

If I understand correctly, you are referring to https://www.google.com/history/

Then it can track only links you click on Google websites. So you clicking on your friend's profile in Facebook will not get logged in here. Unless it is browser extension it can not track * every * link.

if you use the google toolbar for firefox, you can opt in to web history which tracks exactly what you say. i didn't see the option for it in chrome, and i don't think they make the toolbar for firefox anymore (?) but i used to find it a very useful feature.

Google Analytics?