I've read that you can chop potatoes up to 24 hours before cooking with them, and store them in water in the fridge. I'd like to know how long can chopped potatoes be left without soaking in the fridge? I'm not expecting them to last to the next day, but if I need to pop out for a short time before cooking can I chop the potatoes before I go out and avoid the need to find room in the fridge for a large bowl of water? For example, would they last okay for 5 minutes? 10 minutes? Half an hour?
Clarification: This question is about any deterioration in quality. From the responses here it sounds like discolouration will occur long before any safety problems, so that's what I would like to know about the timing of. How long can a chopped potato be left exposed to the air before it discolours?