Might have taken 30s sustained ND or even more but personally I don't share the pesssimism that it wasn't technically possible.
- firstly, this is not really relevant to this accident since the crew did not have the first notion that they were 'stalled', but way back in the dark annals of the multiple threads on this I posited that 20k would be my guess at the absolute lowest recovery altitude and below that they were in yet another 'coffin corner'.
Posters talking about '30 secs sustained ND or even more' need to remember that
a) This a/c was descending at around 10,000 fpm ie from 10k, one minute to impact
b) A pitch change of around
30-40 degrees nose down would have been required to initiate unstall, which would probably have raised the r o d to around 20k fpm
c) Now pull out at xxx g?