( ( Rehearsal periods ) ( ( ( last ( ( approximately 3 ) weeks ) ) ( before ( production load-in ) ) ) . ) )
(ROOT (S (NP (JJ Rehearsal) (NNS periods)) (VP (VBP last) (NP (QP (RB approximately) (CD 3)) (NNS weeks)) (PP (IN before) (NP (NN production) (NN load-in)))) (. .)))
Rehearsal periods last approximately 3 weeks before production load-in.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))