On my DK I got boots from the dungeon time walking reward and the Ulduar time walking reward.
Can we please put a cooldown on slots that you have already received a reward for?
It is really very VERY tilting getting double the same slot literally within 90seconds.
now imagine they put a cooldown on slots, you only need the trinket from Ara-Kara, so you have that key on farm, and you get the wrong trinket drop. you then have a cooldown before you can get the right trinket drop.
that would be shocking. I understand why you think it might be a good idea, but it really seems like a use case situation that had a downside too.