According to the toxicity curve from wikipedia, even at 2.5 bar, you wouldn't start to see issues until ~4 hours have past. That's enough time to remove quite

According to the toxicity curve from wikipedia, even at 2.5 bar, you wouldn't start to see issues until ~4 hours have past. That's enough time to remove quite a bit of CO. https://en.wikipedia.org/wiki/Oxygen_toxicity#/media/File:Pulmonary_toxicity_tolerance_curves.svg https://en.wikipedia.org/wiki/Oxygen_toxicity#/media/File:Pu...