> (TUC) ..is.. 20-30 minutes at 18000', 3-5 minutes at 25000'
> I think anyone flying w/o O2 willingly above 12500 is really asking for disaster

there were lots of kids walking right past this wildly out of shape 38year old
as I trekked from 11,675 to 12,392 to ski Aspen Highlands bowl last week..
so there are lots of people that work well (or alot better than I) at 12.5

is TUC linear or exponential? I'd love to see a graph like
scuba divers use for nitrogen narcosis for time a depth.