For how long must the symptoms of posttraumatic stress disorder occur before the diagnosis is made?

1. Symptoms include intrusive memories, flashbacks, avoidance of reminders, negative emotional states and an exaggerated startle response. 2. For the diagnosis to be made, those symptoms must occur for at least one month. 3. One week is the threshold used for a manic episode, so that option borrows from a different disorder. 4. Six months belongs to generalized anxiety disorder and two years to persistent depressive disorder. _Source: OpenStax Psychology (1st ed., CC BY 4.0), Ch 15 "Psychological Disorders", section 15.6 Posttraumatic Stress Disorder_