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Over what time period does the action of Tosca take place?

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Art Nouveau poster by Adolfo Hohenstein for Puccini's opera Tosca, showing a woman in a gold dress standing over a fallen figure, with dramatic red and black background and bold title text. — Tosca Poster by Adolfo Hohenstein for Giacomo Puccini's opera *Tosca*, 1906.

The action of the opera Tosca takes place in Rome over a period of less than 24 hours, beginning at noon on June 17, 1800, and concluding at dawn the following day.1