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Must be pizza delivery estimate minutes.
It’s not a very pretty looking watch.
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How much air is in the tank is not a simple factor of time and will vary massively according to exertion. The tank generally has its own gauge.
Timing with a divers watch is more about decompression stops as the more time spent at a certain depth = longer decompression stops on the way back up.
underuser53929
Regal
@Ordinata
Must be dive tank minutes.