It depends on the amount of shredded potatoes and the blanching temperature. If the shredded potatoes are cut thinner, it may take less time to blanch them. If the shredded potatoes are cut thicker, the time may be longer.

After the shredded potatoes are cut, soaking in water can reduce the starch content, but it should not be left in water for too long, otherwise the taste and nutrition will be greatly reduced, and it is usually soaked for one day at most. If you don't eat it after a day, eating shredded potatoes is not only very easy to soften and break, but also may breed harmful microorganisms such as bacteria, which will make people eat it by mistake and endanger their health.