bottom time

noun Scuba Diving.
the total time, in minutes, from the beginning of a descent to the beginning of an ascent.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
As a scuba diver, this would give me more bottom time, and a more efficient way
  of doing the various stages of my dive.
We continued down the slope trying to achieve our planned depth in the short
  amount of bottom time allotted.
Define depth, bottom time and minimum breathing gas limits for the planned dive.
The dive mask system displays information such as depth, bottom time, and tank
  pressure.
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