How long is the minimum recommended time at 60 feet when using Treatment Table 7?

The minimum recommended time at 60 feet when using Treatment Table 7 is indeed 12 hours. Treatment Table 7 is utilized for treating severe decompression sickness and involves protocols that require specific durations at various depths to effectively off-gas nitrogen that has accumulated in the body during the dive.

At 60 feet, the table prescribes a duration that allows for the gradual reduction of nitrogen levels, thereby minimizing the risk of additional complications such as further decompression sickness or nitrogen narcosis. Twelve hours is considered the minimum necessary time to ensure that the diver's body can adequately eliminate excess nitrogen and safely return the diver to normal atmospheric pressure.

This duration also helps to allow for the monitoring of any potential symptoms or complications that may arise during the treatment, as well as providing the necessary safety margin required for recovery from such a serious condition.