On a call just now Khoros agree to set the time-out to something longer.  They were going to try to go do it right now,  for the moment, I requested 8 hours.  I think that seems like a reasonable time,  they tend to like to log people out in order to keep webserver open sessions to a reasonable number.

I'm curious what other sites do,  I remember in 2006,  I think it was days.  But not sure.

-eric