How long does it take for pilots to become unconscious after an uncontrolled depressurization at FL 340? I've just read a news article on the depressurization incident that happened today in Australia. How much time did the pilots have before they lose consciousness if they hadn't used their oxygen masks? This incident is said to have happened at FL 340.
According to: Time of useful consciousness:


  
  Altitude (measured barometrically) - TUC
  FL150 (15,000 ft; 4,550 m) - 30 minutes or more
  FL180 (18,000 ft; 5,500 m) - 20 to 30 minutes
  FL220 (22,000 ft; 6,700 m) - 5-10 minutes
  FL250 (25,000 ft; 7,600 m) - 3 to 6 minutes
  FL280 (28,000 ft; 8,550 m) - 2.5 to 3 minutes
  FL300 (30,000 ft; 9,150 m) - 1 to 3 minutes
  FL350 (35,000 ft; 10,650 m) - 30 secs to 1 minute
  FL400 (40,000 ft; 12,200 m) - 15 to 20 seconds
  FL430 (43,000 ft; 13,100 m) - 9 to 15 seconds
  FL500 (50,000 ft; 15,250 m) - 6 to 9 seconds