This is probably a question for Ken,
Ken, Im just curious, do you know what the interval is for which someone is displayed as online?
In particular I mean the situation where someone leaves the forum without logging out, just by leaving the website. It is just that sometimes Im not sure if some person is still around or left long time ago, it seems to me that the interval is probably quite long because I have seen people shown as "online" with last activity about half an hour ago