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Typically a panic attack develops extremely quickly and usually reach their peak within 10 minutes, Most panic attacks end within 20 to 30 minutes, It'll adjust from person to person, but they won't usually last more than an hour (although you may feel very tired after) ! ^_^.
Best Answer: If you are not on medication for anxiety then yes anxiety can last that long. Anxiety lasting that long will trigger a panic attack. If you mind constantly races or you you think this or that is wrong with you it will carry on.It will set it of off an an attack at any given time.eport Abuse. Well panic disorder is a type of anxiety disorder and the attacks can happen without cause. Attacks can last for several hours but most commonly are caused by some sort of extreme anxiety.