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Theorectically, I would think slack tide lasts about 1 sec. The question I would ask is 1) How long does it take for the tide to 'kick' in in the other direction, noticably. Bloo answered that I think. When does the tide run the strongest? Two hours after slack low? Two hours before the high?... I don't know? Depends on location perhaps... And also, how much does wind come into play? It's not easy to judge current direction when wind is opposing the current due to wind drag on line.
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