Okay, so for an example of what I'm trying to describe:
Normal CD (12 second Cooldown):
Cast @ 10
Start = 10
Duration = 12
Start + Duration = 22
Recharge CD (12 second recharge):
Cast 1 @ 10
Cast 2 @ 12
Duration = 12
Start + Duration = 24
However, the expected time for the charges to actually hit 1 is @22sec. (As 2 seconds of recharge have already happened at the time you casted the spell a second time and it's charges hit 0)
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