There are 12 boys seated around a big round table. They play a game with 12 cards. Initially a boy A1 has all the 12 cards with him.
###### Image credit: German Federal Archives

Every minute, if any boy has 2 or more cards with him, he passes a card to the boy on the left, and a card to the boy on the right. The game ends when each and every boy has 1 and only 1 card with him.

How many minutes does it take this game to end?

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