Quote Originally Posted by lans83 View Post
I'm wondering something about this myself now. Say I wanted to farm PoS for the hilts and gear drops. If I don't touch the bosses, and exit and refresh using the LFD tool, will I be locked to the instance and be prevented to reset it as if I were to kill Garfrost on heroic? I know you can farm him all day long with that tool for the Emblems on normal, but can this be done for trash farming on heroic?
You're not locked to a Heroic until you drop a boss. So yes, you could spend an eternity farming the trash for Hilts (and it's been my sorry experience, that that is about how long it takes to see one... lol!).

You're still subject to the maximum of 5 instances per hour, so if you're able to clear and loot all the trash inside of 12 minutes, restting the instance every time, you'll evenutally get the dreaded instance-error.

If your trash clearing time is more than 12 minutes, then you've nothing to worry about and can farm that trash indefinitely.