How long will users show up as being "online"?
 

This is more of a curiosity than anything. When a user views a page/thread/post/whatever, they are shown as viewing that page.

However, if they view the page for a while, leave the computer but keep that browser open to said page, do they stay online as long as the browser is open? Or will they only show up as being online for a predetermined amount of time?

Thanks in advance.