It all depends.... yeah, I know that's not a real answer.
If you check the mfg specs they will or should tell you how much oxy it uses but they are usually telling you the use at max flame settings. Your working style and what pieces you make will vary from that considerably.
I run a Kabuki with the center fire on oxycons. I have a 'K' tank on the outer 2 rings. I almost never run the outer most ring. I use the center ring about 20% of the time making marbles. I often get a month or more out of a 'K' tank. When I had my open studio here I ran the Kabuki and a Baracuda pretty steady on tanks only for about 4 hours and my house guest and I worked several sessions of about 3 hours each and I used about 80% of one "k" tank. As they say "your mileage will vary".
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