How long will a size ML6 oxygen cylinder last?

Answer:
An ML6 oxygen cylinder, when "charged" to normal pressures, holds 170 liters of oxygen. How long that will last depends on a number of factors.
If the flow is set to 2 liters per minute continuous then it will last less than 1 and 1/2 hours. If an oxygen conserving device is used (they give the gas in pluses when breaths are taken) it can last over 4 hours.
First answer by Powerish. Last edit by Powerish. Contributor trust: 77 [recommend contributor recommended]. Question popularity: 1 [recommend question].