How Long Do Oxygen Tanks Last? - Reference
Mar 27, 2020·Oxygen tanks can last between 0.75 and 37.5 hours. How long they last depends on the size of the tank, the pressure in the tank and the flow of oxygen, which ranges from 0.5 to 5 liters per minute. For example, a D-size tank that is full last only 1.25 hours at 4 liters per minute but can last 10 hours at 0.5 liters per minute.