Question: What is the longest running time out of the tv shows which were produced by Henry Winkler?
Answer(s):
answer: Dallas Reunion: The Return to Southfork

SPARQL query:
PREFIX ns: <http://rdf.freebase.com/ns/>
SELECT DISTINCT ?x
WHERE {
FILTER (?x != ns:m.024jwt)
FILTER (!isLiteral(?x) OR lang(?x) = '' OR langMatches(lang(?x), 'en'))
ns:m.024jwt ns:tv.tv_producer.programs_produced ?y .
?y ns:tv.tv_producer_term.program ?x .
?x ns:tv.tv_program.episode_running_time ?num .
}
ORDER BY DESC(xsd:integer(?num)) LIMIT 1