Originally Posted by
Imnick
On a six minute fight;
25% damage for 40 seconds, 6 second cast time
First 40 seconds are free
7 Evocations required for full fight duration (overruns by 2 seconds)
318 seconds of 125% damage, 42 seconds of 0% damage
0.88% uptime
125 * 0.88 = 110% damage
15% damage for 60 seconds, 3 second cast time
First 60 seconds are free
5 Evocations required for full fight duration (overruns by 15 seconds)
345 seconds of 115% damage, 15 seconds of 0% damage
0.95% uptime
115 * 0.95 = 109% damage
The gap is increased slightly by the fact that original evocate scales better with Haste, Frost's best stat, but it does not widen all that much.
The longer the fight is, the more we favour a shorter evocation.