I came across this statement by a reputable source, MoreBeer, on the sales page for an aquarium pump, which pumps only filtered room air through a 2 micron stone: "The down side is that aeration takes longer than oxygenation...[and so] the diffusion stone must be left running in the wort for approximately 30–120 minutes (however even 5 minutes of aeration is better than shaking the carboy.)" This implies that more time, up to 120 minutes = more dissolved O2, by using ONLY room air. Is it true that I can aerate beyond 8 ppm by aerating longer than 5 minutes using this method? According to John Palmer, who references his source in his How to Brew book, clearly states that 8 ppm is achievable using this method, but does not provide data for >5 minutes. Even Wyeast states 8ppm is the max using room air. The yeast are looking for answers.