A traumatised person is likely to be diagnosed with PTSD after having symptoms for how long?

One month. If the symptoms last longer than one month, cause great distress, or interfere with work or home life, PTSD is likely to blame. PTSD symptoms usually start soon after the traumatic event, but they may not happen until months or years later (delayed-onset PTSD). At three months or less, a patient is said to have acute PTSD. At three months or longer, chronic PTSD is the diagnosis.