I\'m running servers in a AWS auto scale group. The running servers are behind a load balancer. I\'m using the ELB to mange the auto scaling groups healthchecks. When servers ar
the documentation (now) states "The grace period starts after the instance passes the EC2 system status check and instance status check."
So, at least according to the mid-2015 AWS documentation, the answer is "after the servers passed the system and the instance status checks." This is how we've set up our environment, and although I haven't done precise timings it appears to be correct.