4.8 Copper-plated parts with a total surface area of ​​522 dm2 and an average copper coating thickness of 17 μm are placed in a cyanide bath to correct defects as anodes. Current 500 A; valence Cu +1; copper density 8.9 g/cm3. How much time is required to completely remove the copper layer from the parts if the anode current efficiency is 95%?

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