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Professor Croaker’s law

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Professor Croaker’s law states that five hours is the longest someone can go back in time without a possibility of serious harm to the traveller or time itself.[1]

This law may have been formulated by Saul Croaker, a life-long employee in the Department of Mysteries at the British Ministry of Magic.


Notes and references

  1. Harry Potter and the Cursed Child, Act Two, Scene Sixteen