Conversation so far:
when did Luigi Luzzatti become prime minister?
1909 .
what was he doing before he became prime minister?
minister of agriculture.
was he good as prime minister?
he showed lack of energy in dealing with opposition and tried to avoid all measures likely to make him unpopular.

Question: For how long was he prime minister?
Self-contained rewrite: For how long was Luigi Luzzatti prime minister?