If the user log's out correctly, they will instantly disappear from the who's online info, if you want the who's online to refresh faster, change the refresh time thru the admincp or manual refresh the page yourself.
As to user's "just closing the browser" and not logging out properly, they will show until the time out of your cookie session is reached, by default its 900s, you would need a custom modification to try to achive what you want when the user don't log out correctly or lower the cookie timeout thru the admincp.
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