It's the time it would take for your body temperature to heat up to the threshold. You wouldn't survive that long if you're that hot, too. 

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> On Oct 15, 2013, at 7:12 AM, "Giacom" <notifications@github.com> wrote:
> 
> In code/modules/mob/living/carbon/human/life.dm:
> 
> > @@ -483,6 +483,10 @@
> >  					if(on_fire)
> >  						apply_damage(HEAT_DAMAGE_LEVEL_3, BURN)
> >  						fire_alert = max(fire_alert, 2)
> > +						if(!(facial_hair_style == "Shaved") || !(hair_style == "Bald"))
> how is this going to be delayed for 10-20 seconds?
> 
> —
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