How long does an E tank of oxyygen last at 2 liter flow?

An E tank of oxygen typically contains about 660 liters of oxygen. At a flow rate of 2 liters per minute, the tank would last approximately 330 minutes, or about 5.5 hours. However, actual duration can vary based on factors such as tank pressure and individual breathing patterns. Always monitor your oxygen supply and consult with a healthcare professional for specific use cases.