How long does a 80cf tank normaly last?

Hi i'm new to all this and i just want to know about how long a 80cf tank lasts?

I haven't used a 80cu ft tank in a while but it normally lasted about 45 minutes to an hour for me and had 500psi left. It will depend on a lot of factors how long the tank will last. One is the diver with his sac rate and workload. The deeper you go the more gas you will need to fill your lungs so it will be used up faster also. Colder water will cause you to use gas faster also. I've seen some people use up a tank in half an hour and others go more than an hour. If you're looking at buying your own tank I would recommend a low pressure 95. Source(s): Scuba diver for 6 years. 300+ dives in the puget sound.

There are a lot of factors that come into play here.
1/ Depth- The deeper you are, the more gas is used to simply allow you to take a breath. That external water pressure on your lungs means that the regs have to give you at least that same pressure to enable you to take a breath. That increased air pressure means more gas molecules in a lungful in the same volume of space. Breathing at 2 atmospheres of pressure takes double the gas to get the same volume. 3 atm takes 3 times as much and so on.
2/ Your physical fitness and size. The smaller you are, the less air you need. Women traditionally aren't air hogs. They're smaller in stature as a rule. Good cardio means your gas exchange in the lungs is better. You use less gas.
3/How you swim- I you're properly trimmed out and not in a slight feet down posture as you move through the water column you create less drag and it takes less energy to move. You use less gas. If you're gear is streamlined to you, no hoses or snorkels hanging out at odd angles. That means less energy wasted and less gas used.
Do you use your legs constantly, even when you don't need to? You're wasting a lot of air there. The legs are the largest muscles in the body and eat air up. If you only use them when you need to you can cut down gas consumption considerably.
4/ How you breathe- A lot of divers waste air by simply not using it properly. They take shallow breaths. This wastes a lot in exhalations by not giving gas exchange a chance to happen in the lungs and can actually increase your breathing rate by building up CO2 in dead air spaces. You use more air this way. Instead try long, deep inhales and exhales. Saves air in the long run.
So...there really is no definitive answer. I have seen air hogs suck a full 80 dry at 30 feet in 20 minutes. I've seen sippers on the line after they've done a dive to 150 feet and have a 40 minute deco still to do offering air to the hogs and still surface with over 1,000 psi in the tank.
commercial diver, IANTD techie, chamber op, gas blender

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