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Credit: David Curtis age fotostock Getty Images. Cut lemons that aren't refrigerated must be used the same day. If the lemons are cut and placed in the refrigerator, they stay fresh for two to three days. Lemon juice in a resealable container stays fresh in the refrigerator for four to six months. Fresh-squeezed lemonade should be consumed the same day it is prepared if it is not refrigerated. If the beverage is refrigerated, it can be consumed for up to a week.
In fact, I would guess 12 to 24 hours if the cut lemon is stored properly. As far as the beneficial nutrients in lemons, such as citric acid, vitamin C, potassium, calcium, phosphorous and magnesium, these should be mostly preserved in the properly stored cut lemon for 2 to 4 days.