I pitch then immediately dose with O2. No more oxygen or air from that point on. I think ^that rule^ is screwed on too tight 
If facing a huge brew (like over 100 points) some presumably knowledgeable folks recommend a second dose of O2 at Pitch + 6 hours. I have never done same, but the premise is the yeast are still ramping up cell counts and as they typically exhaust the initial dose of O2 quite quickly a second round can inspire larger cell counts, quicker. I've never read of a similar recommendation beyond 12 hours post-pitch...
Cheers!
If facing a huge brew (like over 100 points) some presumably knowledgeable folks recommend a second dose of O2 at Pitch + 6 hours. I have never done same, but the premise is the yeast are still ramping up cell counts and as they typically exhaust the initial dose of O2 quite quickly a second round can inspire larger cell counts, quicker. I've never read of a similar recommendation beyond 12 hours post-pitch...
Cheers!
