You shouldn't need to spend more than 2 hours on such a small forum anyway! Thing is, I leave a Tab open on Firefox for this site, one for Youtube, one for GameFAQs, etc., and I find it more than a bit annoying when I come back to the tab to refresh and see if there are any new posts and find out I got logged out for no apparent reason.
You think it's a site setting? Try checking it out. This site feels like it has similarities to an Invisionfree one, so that option could be around somewhere on the Admin Control Panel. I know because I have one.
But I haven't seen it in YEARS!