Note: this is on any version, but it wouldn't let me leave the prefix blank. Okay, so by default, after 15 minutes of inactivity, users disappear from the Members Online Now section and Current Visitors page. However, their last location still shows for a while before disappearing. For example, "Amaury was last seen: Viewing forum list, 59 minutes ago." After another minute, it'll change from X minutes ago to Today at X (or Yesterday at X if it's close to the next day already), which stays there for a while and then disappears. Usually I notice that their last location disappears anywhere after an hour and 30 minutes or two hours have passed. However, sometimes I've noticed it disappear only a little after an hour has passed. So what exactly does this depend on?