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It also depends on whether the boat is stored on the hard or in the water. If it is on the hard, the sanding will probably have an effect for longer, as the chance of growth fouling the bottom is greatly reduced.
That said, I seriously doubt that fairing your boat's bottom with sandpaper is going to make much of a difference, unless it is in really lousy shape. Time spent practicing tacking and gybing is probably a far better investment.
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