Hi emma, I honestly can't say how long because everyone is a little different and a lot depends on one's environment too. I also think it depends on the trauma because I think each person is different depending on the size of their hypocampus and how the trauma affected that area. If you can get outside and take walks in the fresh air that can help. PTSD tends to lead to a person isolating, I know I began doing that myself. But, I did not completely isolate and I do get outside and walk around and get fresh air.