Over Time Spell
Over Time spells apply healing or damage over a period of time in ticks.
(Duration of Spell / 15) = Total
3 sec = 20%
6 sec = 40%
9 sec = 60%
12 sec = 80%
15 sec = 100%
18 sec = 120%
21 sec = 140%
Prior to patch 2.0.1, there was a 100% cap on over-time spells longer than 15 seconds. This cap has since been removed. The total bonus is divided equally to each tick.
Examples of these spells include: Rejuvenation (Druid), Renew (Priest)
Exceptions of this rule are: Shadow Word: Pain (Priest) - 110%, increased beyond 140% with Improved Shadow Word: Pain, which extends its duration to 24 sec.
Corruption (Warlock) - 93%, can be increased to 129% with talents
Curse of Agony (Warlock) - 120%
Curse of Doom (Warlock) - 200%
[edit] Combination - Standard and Over Time Spell
The bonus for spells that have both a standard and an over time component is divided between them. The over time portion receives the following bonus:
(Duration / 15) / ((Duration / 15) + (Cast Time of Spell / 3.5)) = Portion to Over Time
The standard portion receives the rest:
1 - Portion to Over Time = Portion to Standard
The duration and cast time limits are then applied:
(Cast Time of Spell / 3.5) * Portion to Standard = Total bonus to Standard Portion
(Duration / 15) * Portion to Over Time = Total Bonus to Over Time Portion
Examples of these spells include: Moonfire (Druid), Regrowth (Druid), Immolate (Warlock)