How long will the dark events in xcom 2 stay active?

Some of the dark events (e.g. Fast Response - additional reinforcements in Guerilla missions) become active after a while - how long do they stay active?

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1 Answer

The dark event should say itself. (Though obviously, some, such as the Resistance Mole event, are instantaneous, and have no duration at all).

Generally, for the ones with duration, they last a month.