enough chuckles for a three-minute sketch 
(ROOT (NP (NP (JJ enough) (NNS chuckles)) (PP (IN for) (NP (DT a) (NML (CD three) (HYPH -) (NN minute)) (NN sketch)))))
(ROOT (NP (NP (JJ ) (NNS )) (PP (IN ) (NP (DT ) (NML (CD ) (HYPH ) (NN )) (NN )))))