Hi BOAC,
"Between 1 h 59 min 32 and 2 h 01 min 46 , the Captain attended the briefing between the two co-pilots,....
At around 2 h 11 min 40 , the Captain re-entered the cockpit. During the following seconds, all of the recorded speeds became invalid and the stall warning stopped."
BOAC
how long would it take you? I'm pretty sure how long it would take me.
9 mins in the bunk would be enough time for me to doze off. If I then entered the flight deck and witnessed what was going on - I'd hope it was just a nightmare and that I'd wake up to reality in a minute or two. Once I had diagnosed the stall (without the expected warnings), and ordered the nose down, idle thrust etc - to be greeted with a new stall warning might just confuse me somewhat - since I wouldn't have the benefit of this hindsight.