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Message: <blockquote data-quote="Wippit Guud" data-source="post: 1028265" data-attributes="member: 720">Ok, I'm no science major, but here's what I've come up with....Human body needs 500 liters of oxygen/day to live.A 10x10x10 cell (1000 cu ft) is can hold 28316 liters of airOxygen is 20% of air, so 20% of that is 5663 liters... so, there's enough oxygen to sustain through the duration. But lack of oxygen isn't want's gonna kill you, CO2 is.So.An average set of human lungs hold 6 liters of air. And on each exhale 4% of that volume is CO2. Normal CO2 levels in the air is next to nothing, .0314% We'll say 0% for this.Humans breath 8-12 times a minute. Since this is a stressful situation, being stuck in a forcecage, we'll go with the high end of 12. 72 litres of gas echanged per second, of which 2.88 liters is CO25% CO2 level kills. 5% of a 10x10x10 cell is about 1133 liters. With 2.88 liters/minute of CO2 filling the room, soooooo...You die in just over 6 and a half hours. Note: that's based on humans breathing at normal rates. As a DM, I'd say 4 hours.</blockquote>