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@Rachael R, The answers to your questions are a little complicated. I think it would help you to read this post. https://clusterbusters.org/forums/topic/5627-notes-about-welding-o2/ And maybe also the part near the beginning, headed "Oxygen," in this post. https://clusterbusters.org/forums/topic/6213-basic-non-busting-information/ You might still have questions, but maybe they'll be easier to answer. I don't understand why so many doctors say that medical O2 can't be obtained. Did she give you a specific reason (insurance? Covid-related shortages?). Usually, there's a way. This might be in one of the posts, but the way to calculate very roughly how long a tank will last is to divide its capacity in liters by the flow rate you will be using (which is measured in liters per minute). US welding tanks are stated in cubic feet, so you have to convert that capacity to liters. Say you have a 60 cubic foot tank. That's 1699 liters. I know that because I typed [60 cu ft = liters] into google and it told me the answer. If you were using a flow rate of 15 lpm (liters per minute), you would get 1699/15 minutes of oxygen from the tank, or 113 minutes. For a bunch of reasons, you can only really rely on getting about two-thirds of that as fully useful O2 for aborting, or about 75 minutes. You might use a higher flow rate, which would theoretically mean that the tank would empty faster -- but many people get faster aborts with higher flow rates, so they might get as many or more aborts from a tank as someone using a 15 lpm flow rate. (Like I said, it can be a little complicated -- but of course the simple urgency is to get O2 and start aborting with it. The rest works itself out.)

Sorry for the late response. This is the regulator I use. https://www.amazon.com/Oxygen-Regulator-Standard-Body-CGA540-protector/dp/B0069817G8/ref=sr_1_51?gclid=CjwKCAiA_6yfBhBNEiwAkmXy58vLA8apcUX0kTfMIduqxtaXZOjCI_n9M-TEOdVCUz0sD7NuFp3sAhoC-dIQAvD_BwE&hvadid=580937023198&hvdev=t&hvlocphy=9030351&hvnetw=g&hvqmt=e&hvrand=12012740884106048413&hvtargid=kwd-38833742&hydadcr=982_1014986896&keywords=medical+oxygen+regulators&qid=1676443596&sr=8-51&ufe=app_do%3Aamzn1.fos.006c50ae-5d4c-4777-9bc0-4513d670b6bc The bottle time depends on how high flow you use and how long it takes to abort the hits. It has worked well for me.