For some it takes more time than others, but they will. Unless you have been there, it is difficult to understand. If you have been in this situation, you know the adrenaline starts flowing as it prepares you to fight or run. Your heart speeds up, your breathing rate increases, and you are just plain scared and want out. Once you have left the danger zone and found a safe place, your body starts returning to normal.
Some people have a relapse.
Most get over it much faster than they got over the first bout. Sometimes this relapse lasts for a few days. Other parts of this site contain a great deal of information. Also, you can read general descriptions of panic attacks here . The ill person trusts the support person to see that no harm comes to them.