Originally Posted by
EDLB
How long may it take to estabish communication with ATC? 1 minute, easy may be more. With 30 seconds of usable conscience at 30+ thousand feet if things go really wrong with fast dropping cabin altitude that is a Helios 522 recipe.
The "Establish communication" is with the other pilot (for 2 crew operation), NOT with ATC! Please tell us you knew that and were just trying to wind us up?
EatMyShorts had it exactly right.
Don masks
Establish communication
Emergency descent