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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.
For children under 12, please see our Childrenâs Dosage Guide for recommendations. With this standard dosing suggestion (for adults) of two droppersful three times a day, tincture bottles typically last this long: 1  1oz. tincture bottle will last about one week. 2  2oz. tincture bottle will last two weeks.3  4oz. tincture bottle will typically last about a month.or children under 12, please see our Childrenâs Dosage Guide for recommendations. With this standard dosing suggestion (for adults) of two droppersful three times a day, tincture bottles typically last this long: 1  1oz. tincture bottle will last about one week. 2  2oz. tincture bottle will last two weeks.