How long was Henry Campbell-Bannerman a member of the 20th Parliament of the UK?
SELECT ?value1 ?value2 WHERE { wd:Q106618 p:P39 ?s . ?s ps:P39 wd:Q41582560 . ?s pq:P2715 ?value1 . ?s pq:P1534 ?value2 }
henry campbell-bannerman: Q106618 member of the 20th parliament of the united kingdom: Q41582560