Talk:Cooldown reduction/@comment-4862375-20120523053325/@comment-84.53.100.186-20120523072312

CDR is calculated at the exact moment of casting the spell.

Let's say a cooldown is 2 seconds after calculating in 40% CDR, ryze's passive will lower it with 1 second for each spell cast after that. Meaning two spells will reset the cooldown.