Originally Posted by muddstopper
The life span of microbes is about 1 1/2 minutes, in an un-oxygenated enviroment. teas last about 6 minutes, not hours.
Looks like we both are right. Taken from the Soil Food Web.
If the aeration is turned off, it typically takes some time for the organisms to use up the air, and plunge into anaerobic conditions. A truly stable tea would only slowly use up oxygen and go anaerobic, usually in about 5 to 6 hours. But if the tea is not in a stable condition, then when aeration is turned off, oxygen levels will plunge within mere minutes to low, anaerobic levels.