[Wikidata] Query on scholarly article fails

[Fabrizio Carrai]

Hello all,
the following query ends with a timeot:

SELECT ?istanza_di ?istanza_diLabel WHERE {
  SERVICE wikibase:label { bd:serviceParam wikibase:language
"[AUTO_LANGUAGE],en". }
  ?istanza_di wdt:P31 wd:Q13442814.
}
LIMIT 10

Can anybody explain why ?
Thanks in advance

-- 
*Fabrizio*

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