Conversation so far:
When did Luigi Luzzatti become prime minister?
With the resignation of Sidney Sonnino, Luigi Luzzatti was called upon to form a cabinet himself. His administration lasted until March 18, 1911.
What was Luigi Luzzatti doing before becoming prime minister?
Luigi Luzzatti was minister of agriculture in the second Sidney Sonnino Cabinet from 1909 to 1910.
Was Luigi Luzzatti good as prime minister?
Luigi Luzzatti didn't have the character necessary to lead a government: he lacked 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?