I have noticed, in my days of stock SH3, my CO2 gauge would take about 5-10 minutes of running on the surface before the air throughout the boat would be refreshed. Makes sense, it takes time to ventilate the entire thing, not seconds after the hatch is opened. And if the waves are too high, and keep breaking over the conning tower, forcing the watch crew to hold their breaths, it can delay the whole procedure.
I'd be concerned if the air does not refresh within 1 hour of normal surface running with calm, flat seas. As I've said, I rarely have to wait longer than 15 minutes, with the worst weather.
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