( Hours ( ( are ( ( approximately 30 ) ( per week ) ) ) . ) )
(ROOT (S (NP (NNS Hours)) (VP (VBP are) (NP (NP (QP (RB approximately) (CD 30))) (PP (IN per) (NP (NN week))))) (. .)))
Hours are approximately 30 per week.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))