, the hours represents two of those well spent 
(ROOT (S (, ,) (NP (DT the) (NNS hours)) (VP (VBZ represents) (NP (NP (CD two)) (PP (IN of) (NP (NP (DT those)) (VP (ADVP (RB well)) (VBN spent))))))))
(ROOT (S (, ) (NP (DT ) (NNS )) (VP (VBZ ) (NP (NP (CD )) (PP (IN ) (NP (NP (DT )) (VP (ADVP (RB )) (VBN ))))))))