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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) ! ^_^.
I've had some long attacks though in the past. Like my worst panic attack ever which is in my diary. It was an intense attack that lasted for probably well over an hour. Anxiety attacks and panic attacks can feel a lot alike and also can go hand in hand in waves like slugzzz was saying.