High turnover/stress at multi-manager platforms?

Hi guys, just wondering if anyone has any insight into the culture at multi-manager shops like Balyasny or Citadel. I get the impression that these are highly stressed environments with lots of staff turnover. If you're an analyst at one of these places and your PM gets the chop after a few quarters do you automatically get the chop too? Also, can someone explain the stop-out risk limits at these places? Is it on a position or portfolio level?

Thanks!