a film really has to be exceptional to justify a three hour running time 
(ROOT (S (NP (DT a) (NN film)) (ADVP (RB really)) (VP (VBZ has) (S (VP (TO to) (VP (VB be) (ADJP (JJ exceptional)) (S (VP (TO to) (VP (VB justify) (NP (DT a) (NML (CD three) (NN hour)) (VBG running) (NN time)))))))))))
(ROOT (S (NP (DT ) (NN )) (ADVP (RB )) (VP (VBZ ) (S (VP (TO ) (VP (VB ) (ADJP (JJ )) (S (VP (TO ) (VP (VB ) (NP (DT ) (NML (CD ) (NN )) (VBG ) (NN )))))))))))