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Realistic Metabolites [StationeersMods]

modifies metabolism to be based on the cellular respiration equation.

C6H12O6 + 6O2 + ~30ADP + ~30Pi -> 6CO2 + 6H2O + ~30ATP

each mole of oxygen when breathed turns into:
1 mole carbon dioxide
1 mole water as condensate

Human ATP turnover rate is estimated to be about 10^19 to 10^21 ATP molecules per second

solving for oxygen usage:
(6 / 30) * 10 ^ 20 = 0.2 * 10 ^ 20 molecules of oxygen per second
(0.2 * 10 ^ 20) / 6.02 * 10 ^ 23 = 3.3222 * 10 ^ -5 = 0.000033222 moles of oxygen per second

literature seems to lean on 200-250ml of oxygen per minute for a average human at rest without further clarifications.
that plus some assumptions and trial and error lands you on 0.000546875 moles of oxygen per second.

since a stationeers day is 20 minutes that means there's a 24h/20m = 72x time multiplier.

0.00029 moles per second * 72 = 0.02088 moles per real life second.

with this in mind the oxygen consumption has been set to 0.02088 moles per real life second.
default numbers from the game works out to be about 0.0192 moles per real life second, so not far off.