Simple Mod? How to do this? Duration spent on site.

[Chris583]

I've been looking for this thing I have seen on other forums, not sure what I have to do to get it or enable it but here is what it looks like.

See what is highlighted in the following images? It shows up both on the index of the forum and in everyones post.

Doesn't look like its very difficult, for all I know this is an included feature of VB I don't know about. I'm running 3.7 on the new boards I'm making.

I would highly appreciate someone whom could tell me how to do this, or point me in the direction of a mod or other means to accomplish this!

Thanks!