I think the code for that is in profile.php, and it looks like there's a "profile_start" hook that you could use for a plugin to check the values. Of course you'd have to figure out what variables to check to determine if a specific field is being updated, and figure out what to do if the value is below minimum length. One thing that confused me when I first looked at that code is remembering that $_REQUEST['do'] and $_POST['do'] are two different variables.
Hope this helps. Maybe someone will know more about this and will post a reply.
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