Short Answer:
One or two weeks, maybe more.
Long Answer:
While there is no set length of time, cold sores can last up to 2 weeks. If you can start treating it very early in the beginning you may be able to reduce the length of time significantly. In many cases it can be only 3-5 days in duration. The key is treating it as soon as you notice something is not right such as tingling or swelling.
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