Hypervigilance, a hyperarousal state where you are constantly scanning your environment for any sign of danger, is often associated with PTSD (post traumatic stress disorder). So the hypervigilance lasts for as long as the PTSD lasts. Unfortunately, PTSD can last a long time, and in some, can last a lifetime. The good news is that there is effective treatment for PTSD, and hence hypervigilance. Please see the rest of AnxietyBoss.com for more help and information on PTSD and hypervigilance.