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Message: <blockquote data-quote="Ridley's Cohort" data-source="post: 144287" data-attributes="member: 545">The cold is a non-factor on the scale of several minutes.  This is because you will only cool by evaporative and radiative cooling.  Radiative cooling is very slow.  Evaporative cooling might be a problem, but that will be the low on your list of worries unless you somehow find the air to breathe somehow.I think the simple thing is to make a Fort save every round after the first, bumping up the DC every round.  Fail and you lose consciousness.Upon reconsideration, if you knew you were about to be exposed to vacuum, I think you have two plausible options:(1) Exhale completely and hold your breathe.  The residual air will expand to fill your lungs but not be an unmanageable volume or pressure.  (This may not work if "empty" lungs have volume more than ~1/4 of "filled" lungs.)(2) Hyperventilate and hope the extra oxygen in your blood stream will help.Either way will probably only make a difference of a few seconds over doing nothing.  When the partial pressure in your lungs drops sharply you will be losing oxygen out of your bloodstream into your lungs quickly no matter what you do.</blockquote>