Question: what is the incubation period for a cold sore?
Answer: How long can herpes go undetected? Once you've contracted HSV, there will be an incubation period — the time it takes from contracting the virus until the first symptom appears. The incubation period for HSV-1 and HSV-2 is the same: 2 to 12 days. For most people, the symptoms begin to show up in about 3 to 6 days.