I've got some lotus root that I had in the fridge about a week before I opened it. I left the lotus root in the water in which it was packaged and I'm wondering how long it stays fresh. It still looks like the day I got it and it's been 2 plus weeks. I thought what the hell, looks fine, and ate it and it's still the same old lotus root.
The link states it can be kept uncut for 2-3 weeks in the fridge, while cut pieces can last up to 5 days. I think since it's a root it should hold up much like a carrot or turnip or other like fleshed vegetable.