A normal nose of an adult processes on average 10,000 liters of air in 24 Hours.

http://en.wikipedia.org/wiki/Empty_nose_syndrome

The turbinates play a vital role in protecting the inner nasal mucosa and allowing it to recuperate and regenerate. A normal nose of an adult processes on average 10,000 liters of air in 24 hours, it therefore needs some form of resting period to recuperate and maintain good health and integrity of the delicate respiratory epithelium layer that lines the entire nasal airway and sinuses.