How long until nostril incision is healed completely? (photo)

I had a bit of concern about one of my nostril incisions not healing properly and when I went to see my surgeon he should that heal up in time. I forgot to ask him how long it would take though. My last visit was about 3 weeks ago. The issue I was having was that when I pressed down on the skin below my left nostril, I could see a small gap between my nostril incision and the skin on my face. My question is how long will it take until the incision is fully healed is closed up?