At the time of writing, the longest (real) quality name that we have recorded is <a href="/wiki/An_Eager_Substitute_in_the_Form_of_(a_Double_of)_the_Manager_of_the_Royal_Beth" title="An Eager Substitute in the Form of (a Double of) the Manager of the Royal Beth">An Eager Substitute in the Form of (a Double of) the Manager of the Royal Beth</a>. (Trust me, I have database access.)