Duration

'Duration refers to the length of time an effect lasts. This could refer to the time a skill lasts, including curse, minions or totems, or the length of time a buff or debuff lasts, or a number of other effects.

Changes to the stat Skill Effect Duration will only affect the duration of skills with the duration tag. Many other duration stats can be found on the passive skill tree, usually referring to the duration of a single type of effect.