Thus, it might take a very long time for a signal from the flagship to be relayed to the entire formation. It was usually necessary for a signal to be confirmed by each ship before it could be relayed to other ships, and an order for a fleet movement would have to be received and acknowledged by every ship before it could be executed. In a large single-column formation, a signal could take 10 minutes or more to be passed from one end of the line to the other, whereas in a formation of parallel columns, visibility across the diagonals was often better (and always shorter) than in a single long column, and the diagonals gave signal "redundancy", increasing the probability that a message would be quickly seen and correctly interpreted.