timster - 5:02 pm on Jan 31, 2008 (gmt 0)

does long tail traffic last longer than other?

In my experience, the answer is generally yes, it's more common for a minor key phrase to stay on top of the SERPs.

As to why that is, here are my guesses: There are few webpages that are really competing with yours, and competing sites aren't likely to fight to hard to beat you in the SERPs on minor terms either.