How long does a scuba tank of air last?
This is a common question that, unfortunately, doesn’t have a single answer. People breathe at different rates, and you breathe faster when you’re swimming than when you’re resting. Also, the deeper you go, the more you use your air, and, you can get different size tanks. So, the answer is “it depends;” this is why divers have a gauge that tell them how much air they have at all times. As an approximation, a diver sightseeing in calm, warm water at 20 to 30 feet deep can expect the average tank to last about an hour.
