Hermione, when asked by Harry, says she doesn't know how long the Polyjuice potion they're using to infiltrate the Ministry will last. But she had already established in Harry Potter and the Chamber of Secrets that Polyjuice potion lasts for exactly one hour. JK Rowling has stated that how long the potion lasts varies depending on how well it's brewed.

Film

Harry Potter e i Doni della Morte - Parte 1 (2010)

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