what is the {point in time} for {Bernard Leach} has {student} as {Peter Stichbury} ?
Peter Stichbury spent what years as Bernard Leaches' student?
What years did Bernard Leach have a student named Peter Stichbury?
SELECT ?h WHERE { ?q property:point_in_time ?h . ?q property:student resource:Peter_Stichbury . resource:Bernard_Leach property:student ?q }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2898210> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P802> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q16089985> .
?statement <http://www.wikidata.org/entity/P585> ?value. 
} 

SELECT ?value WHERE { wd:Q2898210 p:P802 ?s . ?s ps:P802 wd:Q16089985 . ?s pq:P585 ?value}