How long should each rescue breath last during CPR?

Each rescue breath during CPR should last about 1 second. This duration ensures that the air is delivered in a controlled manner, allowing the lungs to expand adequately without causing over-inflation or distress. The goal is to provide just enough breath to make the chest rise visibly, indicating that the air is entering the lungs properly. Overly prolonged breaths can lead to complications such as excess pressure in the lungs or gastric insufflation, which can make it more difficult for the person to breathe effectively. The 1-second guideline strikes a balance between effectiveness and safety, ensuring breaths are sufficient without being excessive. This is especially important in a situation where timing and efficiency are crucial for the individual receiving assistance.