A question about Extended lockout.

Blue-tagging this in case there're players out there with the same question you had, Sploin.

Basically, if you extend your lockout for a particular raid, the raid will be in the same exact state as it was last time you were there. So, if you are on the 5th boss, you'll be right back there. Of course, creatures that respawn will respawn, but trash that is bound to bosses you've already killed won't be there, just as it happens during a normal week of progression.