In Das Boot, the boat was aerial bombed on it's attempt to make it through the strait, just like the actual U-96.
She went down to the bottom and stayed there for I think 16 hrs. But the air was contaminated by the crew frantically stopping leaks, and bucketing water from parts of the boat to the bilge. This was A LOT of breathing.
In total the boat stayed at the bottom for 16 hrs.
This time would probably be much higher had the boat made it safety under the waves and no frantic breathing had taken place.
Das Boot in this case is a poor choice to base the game off of.
There is a formula to get a rough estimate for the amount of increase of CO2 levels though.
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