Noticing a lot of posts the last couple of days on the WoW forums.
Seems that the elemental Tier 10 2 piece bonus is bugged. Apparently, instead of lowering the cooldown on Elemental Mastery, it increases it to 7 days.
Thought I'd put this up here so people would be aware, and DON'T EQUIP 2 PIECES OF TIER 10 elemental gear.