Amazon Lead Systems Engineer interview questions

Over all, quite nice interview and I spoke with multiple friendly peoples from AWS. Major problem is that there is very little room for mistakes during final interview which is quite long (5-6 hours), stressful and brain draining. Even if I was told that I did well, I was told as well, that for this position I should do excellent. No one really took for consideration amount of stress which interviewed person is under and that after multiple hours of brain draining questions. This stress and tiredness lead to situation that last hours you're not fully functional on all levels and is easy to do mistake. It took me almost 2 days to analyse my answers and narrow mistake which I made that point to situation that job was not offered to me. Just messed up naming in one of design which I was asked to perform during last hour of interview. I was thinking about 1 thing but I told similar one.