How long does a BOC LIFELINE cylinder last?

The oxygen in the cylinder will expire after 3years. The kit is serviced annually to ensure that everything is in order. In terms of the gas within the cylinder this is dependant on the flow rate at which the oxygen is administered. Flow rates can vary between 1 – 15Litres per minute. The cylinder contains 460Litres of gas. So at maximum flow rates, the cylinder should last just over 30minutes. BOC can also provide a Remaining Time Estimator app, which calculates the remaining time of a BOC Integral Valve cylinder based on the current content and flowrate used. This is free to download from the Apple and Google Play Store.