( It ( ( may ( ( ( take ( many ( ( weeks or ) months ) ) ) ( for symptoms ) ) ( to ( develop ( although ( it ( ( is usually ) ( 2-8 weeks ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (MD may) (VP (VB take) (NP (JJ many) (NNS weeks) (CC or) (NNS months)) (PP (IN for) (NP (NNS symptoms))) (S (VP (TO to) (VP (VB develop) (SBAR (IN although) (S (NP (PRP it)) (VP (VBZ is) (ADVP (RB usually)) (NP (CD 2-8) (NNS weeks)))))))))) (. .)))
It may take many weeks or months for symptoms to develop although it is usually 2-8 weeks.
(ROOT (S (PP (IN By) (NP (CD 8) (NNS weeks))) (, ,) (NP (DT all) (JJ major) (NNS organs)) (VP (VBP start) (S (VP (VBG developing)))) (. .)))