How long is a Forced Expiratory Volume measured?

How long is a Forced Expiratory Volume measured?

The minimum end point criteria with respect to a Forced Expiratory Volume, or FEV, is 6 seconds in length. This is typically the minimum amount of time for the lungs to completely empty of breath. A Forced Vital Capacity (FVC), is the average result of 3 Forced Expiratory maneuvers.