Learning from passmedicine questions – PTSD vs acute stress disorder

Duration of symptoms
Acute stress disorder – 3 days to 4 weeks
PTSD – More than a month

Onset since traumatic event
Acute stress disorder: 0-28 days
PTSD – More than 4 weeks

Acute stress disorder: short term psychotherapy (trauma-focused CBT)
PTSD: long term psychotherapy, medication (SSRI), EMDR (Eye movement desensitization and reprocessing)

Source: Youtube