what is the {end time} for {Ub Iwerks} has {educated at} as {Northeast High School} ?
what was the tenure of Ub Iwerks as a teacher at Northeast High School?
How long was Ub Iwerks a teacher at Northeast High School
SELECT ?w WHERE { ?i property:end_time ?w . resource:Ub_Iwerks property:educated_at ?i . ?i property:educated_at resource:Northeast_High_School }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q336424> .
?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/Q7057903> .
?statement <http://www.wikidata.org/entity/P582> ?value. 
} 

SELECT ?value WHERE { wd:Q336424 p:P69 ?s . ?s ps:P69 wd:Q7057903 . ?s pq:P582 ?value}