( Typically ( , ( volunteers ( ( commit ( to ( visits ( once-a-week ( for ( ( ( 5 weeks ) , ) ( ( each visit ) ( lasting ( ( approximately 30 ) minutes ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Typically)) (, ,) (NP (NNS volunteers)) (VP (VBP commit) (PP (TO to) (NP (NP (NNS visits)) (ADJP (JJ once-a-week) (PP (IN for) (NP (NP (CD 5) (NNS weeks)) (, ,) (NP (NP (DT each) (NN visit)) (VP (VBG lasting) (NP (QP (RB approximately) (CD 30)) (NNS minutes)))))))))) (. .)))
Typically, volunteers commit to visits once-a-week for 5 weeks, each visit lasting approximately 30 minutes.
(ROOT (S (NP (DT The) (JJ fetal) (NN period)) (VP (VBZ lasts) (NP (NP (QP (RB approximately) (CD 30)) (NNS weeks)) (NP (NNS weeks)))) (. .)))