Duration

"Skill Duration" redirects here. For the passive skill, see Skill Duration (passive skill).

Duration is a keyword and refers to attribute of certain effects that continue over time. Specify how long effect remains.

Similar effects - Expiration rate is not calculated the same as duration, but they both are capable of making certain game mechanics last a longer or shorter time.

Exceptions

Duration refers to mechanic of effects not to mechanic of action. Similar characteristics being not related with duration attribute:

• cooldown
• cast speed
• attack speed
• throwing speed
• laying speed
• trap lasts

Mechanics

The duration of a skill effect can be altered with modifiers such as #% increased/reduced [effect] Duration where all increased/reduced modifiers are summed together and #% more/less [effect] Duration where the product of all more/less modifiers are calculated.

The total duration value can be calculated as the sum of any added duration, multiplied by the sum of all increases and reductions to duration, multiplied by all more and less duration modifiers.

$\color[RGB]{163,141,109} \begin{align} a & \text{ the total amount of added duration } & a & \in \mathbb{N}_{0} \\ b & \text{ the total amount of increased duration } & b & \in \mathbb{N}_{0} \\ c & \text{ the total amount of reduced duration } & c & \in \mathbb{N}_{0} \\ d & \text{ the total amount of more duration } & d & \in \mathbb{N}_{0} \\ e & \text{ the total amount of less duration } & e & \in \mathbb{N}_{0} \\ \end{align}$

$\color[RGB]{163,141,109} \begin{align} \text{duration}_{total} = & \sum_{i=1}^{a} \text{added duration}_{i} \times \\ & \left( 1 + \sum_{j=1}^{b} \text{increased duration}_{j} - \sum_{k=1}^{c} \text{reduced duration}_{k} \right) \times \\ & \prod_{l=1}^{d} (1 + \text{more duration}_{l}) \times \prod_{m=1}^{e} (1 - \text{less duration}_{m}) \end{align}$

For more information about the symbols, see sum and product notation.

Skill effect duration modifiers

The Skill Effect Duration mod can increase or reduce the duration of skills with this keyword. Specific types of duration effects such as curses or traps can also have their durations modified by passives or items. Buffs which are not created by a skill cannot have their duration altered.

Generic skill duration modifiers do not affect the lifetime of totems, traps or mines.

Active skill gems with duration related stats

Main page: List of duration related skill gems

Support skill gems with duration related stats

Main page: List of duration related skill gems

Version history

Version	Changes
3.3.0	Modifiers to skill duration no longer modify the duration of traps, totems or mines, but will continue to modify the duration of skills cast by traps, totems and mines if those skills have a duration.