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How long did construction of the main Parthenon building take?

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The Parthenon temple in Athens, Greece, is illuminated at night, showing its iconic Doric columns and partially ruined structure atop the Acropolis. — Parthenon Night view of the Parthenon, Athens.

Construction of the Parthenon began in 447 BCE. The main building was completed in 438 BCE, taking nine years to finish, while work on the exterior decoration continued until 432 BCE, totaling 15 years for the entire project.1