[ugh]

It also remembers when you were looking at search results for more than three seconds (it will even distinguish between normal searches and those three-second things). Unless you can be done in less than three seconds you cannot trick Web History.

[xiongchiamiov]

With link-hinting, it's quite possible to be off the page in under 3 seconds. Of course, the percentage of Google users who use link-hinting is... very small.