Talk:Zilean/@comment-3275908-20140102094432/@comment-5883057-20140104133645

30 seconds. That is the cooldown on his ultimate at 40% CDR. Howver, to get it that low, you need 575 mana - ONLY for the ult.

Calculations: your W has a 3.6 CD, so you cool down at a speed of 13.6 seconds per 3.6 seconds.

108*3.6/13.6 = 28.5 seconds.

By that time, you used 28.5/3.6 times 50 mana, or 397 mana. Add 175 mana for the ult, and you get the 575 mana needed.