Weakaura help! Time between two cooldowns

[2fishbones]

Hi there!

I've been fiddling around, but can't seem to find a way to make this work on my own.

I'd like a Weakaura to trigger when a specific cooldown will be ready at >time earlier than another cooldown.
Eg. it should popup when Vanish will be ready at 20 seconds or more earlier than Shadow Dance - for a sub rogue.

Any help is much appreciated!

[Urtgard]

Trigger 1: Vanish not on cd
And trigger2: shadow dance is on cd and time > 20

[2fishbones]

Yeah, thought about that, only issue is, it doesnt let me know before its too late I'd like to know the time difference between the two ASAP.

[Overdispersion]

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This triggers when both spells are on cd and remaining dance cd - vanish cd > 20 sec. Can probably play around with it more if you want it to display some cd text etc.