what is the {end time} for {Albert Bierstadt} has {educated at} as {Düsseldorf school of painting} ?
Mention the year in which Bierstadt graduated from Dusseldorf school of painting?
When did Albert Bierstadt graduate from the Dusseldorf School of Painting?
SELECT ?q WHERE { ?p property:end_time ?q . resource:Albert_Bierstadt property:educated_at ?p . ?p property:educated_at resource:Düsseldorf_school_of_painting }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q77132> .
?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/Q680559> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

SELECT ?value WHERE { wd:Q77132 p:P69 ?s . ?s ps:P69 wd:Q680559 . ?s pq:P582 ?value}