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The information below will assist you in determining. when to order more oxygen. The most frequently used portable oxygen cylinder is the E tank. When full, it contains enough. oxygen to supply a person using a flow rate of 2 liters per minute for about 4 hours. Please refer. to the tank duration chart to determine how long your tank will last based on the liter flow. prescribed by your physician.
Does anyone have a formula to figure out how long an oxygen bottle will last? Variables will be size of tank (M and D), Liter per minute, and pressure remaining.ach tank will be different and there is no way you will ever know how much each tank will last. Because you never have one tank for NRB's, one for NC, one set at 2 lpm, one set at 4 lpm, etc.