So far my 5 lb'er on my 72 gal has gone one cycle for me. I ran it about the same schedule and bubble count as you and it lasted about 3 1/2 months. When it was running low the gauge that showed 800-900 started dropping over about 2 days to 700, then 600, so I refilled it (actually switched it to a 10 lb now). Based on my experience I think you'll have about 6 months at least with your 10 lb tank.
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