Will it take long?

Computer Science Level pending
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For each row above stands an ant, at number 1, 3, 5 and 7, respectively. After a minute, each of them will walk either to the left or right. If they are at the leftmost/rightmost cell, they can only move to the right / left in the next move. Which options best describe the expected number of minutes before they reach 2, 4, 6 and 8 respectively?

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