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