The Minor is rated at 8 LPM depending on how flame settings are set. With one 5 LPM concentrator expect about 65%. You can do the math to determine how long a tank would last.
Medical Oxygen tanks, depending on size, would be a limiting factor. In addition there would be the need for a conversion to accept the standard welding type of oxygen regulator that is based on pressure.
Your best bet, if interested in tanked, is to contact one of your local welding supply firms and determine the cost for tank rent and contents. Depending on your usage a 125 CF tank may need frequent refills.
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