I know it's about ten minutes. But does the cooldown begin from the time you consume the Three of Coins? Or does it begin when you kill an Ultra? Or does it begin when you successfully get an Exotic engram? I just find it confusing and want to make the most efficient use of my time.
Thank you!
(P.S. If there is a cooldown timer, why don't they just make it visible for you to see in your Inventory screen? Why make it invisible and all 'secretive'?)
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It's somewhere between 5-15 mins since you killed the last Ultra / completed the last crucible match. Nobody knows the exact cool down time but it starts from when the match ends/ultra dies. You can pop another one right away, you won't be penalized unless the next match ends or another ultra dies before the cool down is complete.