from this three-hour endurance test built around an hour 's worth of actual material 
(ROOT (PP (IN from) (NP (NP (DT this) (NML (CD three) (HYPH -) (NN hour)) (NN endurance) (NN test)) (VP (VBN built) (PP (IN around) (NP (NP (NP (DT an) (NN hour) (POS 's)) (NN worth)) (PP (IN of) (NP (JJ actual) (NN material)))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NML (CD ) (HYPH ) (NN )) (NN ) (NN )) (VP (VBN ) (PP (IN ) (NP (NP (NP (DT ) (NN ) (POS )) (NN )) (PP (IN ) (NP (JJ ) (NN )))))))))