How long will lemon juice stay fresh?

One AnswerKept refrigerated lemons should last a few weeks or a month or so. If your lemons came in a net, they should have a 'best before' date on the label. Another AnswerOnce I tried an old recipe from my grandfather . Put one layer of sand then a layer of salt then a layer of lemons , and so on ! . I can say that lemons can be preserved for around 8 months.