How much Oxygen should I add to my wort?

Short answer: Read up on the Brewing Elements series book "YEAST" by Chris White and Jamil Zainasheff to get an idea of diffusion times and dissolved O2.

Long Answer: Until you get 8-10 parts per million. 

For example: Depending on temperature (we can assume 70F room temperature to avoid hot side aeration), Quality of O2 (we can assume 99.99% medical grade for the example), Volume (let's assume a typical batch is 5.3 gals [20L] final volume), and Original Gravity (let's assume 1.077 since this is a relatively median OG) 

White Labs ran a test with these variables and they recommend 1L of pure O2 for 60 secs. 

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