12 Hour Lockout Clarification

[arsenalpow]

So the full repop happened at roughly 4am EST. When does the 12 hour lockout get lifted, 4pm EST? Does the 12 hour lockout begin when your first mob is killed? So for example BDA kills Talendor at 4:30am or something, then we killed Trak a couple hours later, would that mean when Talendor falls off our bag count at 4:31pm we could then kill another target?

This question was asked to Derubael, who didn't know, this needs an answer.