1-4 hrs but no more. Make sure potatoes are covered with water.
5 years i think
Soak it in water to keep it from browning
There is no reason to. They don't oxidize like potatoes.
Yes you can.
Old potatoes can be rehydrated by mainataining in water 24 hours. Salt water increase the content of sodium in potatoes but it is not important.
Soaking potatoes rids them of their rich potassium. Potassium is a healthy vital nutrient for most people, however, high potassium levels can be dangerous for dialysis patients or people who have kidney failure. My mother was a dialysis patient and if she wanted to eat them we had to soak them at least 24 hours in the refrigerator.
Old potatoes can be rehydrated by mainataining in water 24 hours. Salt water increase the content of sodium in potatoes but it is not important.
They're starchy & porous
Dialysis is not a permanent solution - the worse the kidney function becomes, the more dialysis is needed, until you're at at a stage where you're in hospital on dialysis full time (which is obviously not a life). Transplants are a more long term solution.
I wouldn't recommend having a marinade on potatoes overnight. You can cut your potatoes up the night before and have them soak in water to avoid turning them brown/black. Just make sure the water is about an inch over the potatoes. If you want to marinate, an hour of soak time is good enough for potatoes. It's the oxygen that is touching the potatoes that turns them, so there might be some areas of the potato not completely covered in oil. If you still want to try it, make sure to have an airtight lid on.
No, they don't. That is how you can preserve peeled potetoes overnight, by putting them compeltely in water in the fridge.