I had an instructor, that studied this sort of thing for Uncle Sam.
I do not recall the actual numbers, but he said that depending on the amount of training, the best still only retain about two thirds when it goes hot.
Average training time, not so much.
Also, see #33.
Yes, at “oh, shit!” Time, things get interesting and your body can betray you. Training until you have muscle memory helps , but is not a cure all.
CC
Police hit their targets less than 20% of the time when under fire. This has not changed in decades and seems to be unaffected by conventional training methods.
I am unsure how this might be improved.