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what is the normal exhalation and inhalation duration(in seconds respectively) in a single breath for a average adult

The length of the breathing depends on the characteristics of the person and of what he is doing. We cannot talk of ‘normal duration in seconds of exhatlation and inhalation.’  A breathing reference for a given person could be the rythm of breathing during a calm healthy sleep in an appropriate environment and temperature with which we could then compare his other forms of breathing.