what is the {start time} for {Irving Penn} has {educated at} as {University of the Arts} ?
How many years has Irving Penn taught at the University of the Arts?
How long has Irving Penn taught at the University of the Arts?
SELECT ?n WHERE { resource:Irving_Penn property:educated_at ?v . ?v property:educated_at resource:The_University_of_the_Arts . ?v property:start_time ?n }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q318604> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P69> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q1068615> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q318604 p:P69 ?s . ?s ps:P69 wd:Q1068615 . ?s pq:P580 ?value}