Jointly with "Semiramide", "Guillaume Tell" is Rossini's longest opera, at three hours and forty-five minutes, and the effort of composing it left him exhausted. Although within a year he was planning an operatic treatment of the Faust story, events and ill health overtook him. After the opening of "Guillaume Tell" the Rossinis had left Paris and were staying in Castenaso. Within a year events in Paris had Rossini hurrying back. Charles X was overthrown in a revolution in July 1830, and the new administration, headed by Louis Philippe I, announced radical cutbacks in government spending. Among the cuts was Rossini's lifetime annuity, won after hard negotiation with the previous regime. Attempting to restore the annuity was one of Rossini's reasons for returning. The other was to be with his new mistress, Olympe Pélissier. He left Colbran in Castenaso; she never returned to Paris and they never lived together again.