The Time Turner is an hourglass-shaped object that allows you to return in time. It must be turned a number of times equivalent to the number of hours that must be turned up, the maximum being five hours. Beyond this limit, the traveller is in danger. In Harry Potter and the prisoner of Azkaban it is Minerva McGonagall, famous professor of metamorphosis who gives it to Hermione Granger to be able to attend several courses at the same time. It is the ideal jewel for all overworked sorcerers!
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