I have been making fries at farmers markets for a while. I have been invited to do some festivals and have a question. I usually cut the fries the night before and soak them in water for about 12 hours before we use them. How long do fries have to soak in water before they are ready to fry?

This is an unusual question if I am following you correctly. Typically the question is “how long” can I hold the potatoes in water before they turn gray or come out soggy?  The potatoes can actually be used right away after cutting them, just rinse the cut potatoes until the water runs clear and you have successfully removed most of the excess starch and sugar.