The Exploit "Reality Enforcement" describes its effects, and its range, but it never describes how long it lasts.
Success: Everyone in the immediately area (demon’s Primum x 4 in yards) that is in any way connected to the God-Machine — demons, angels and stigmatics — feels their power and awareness drain away. Angels crash the ground, materialized and solid, but unable to use their Numina. Demons are unable to spend Aether or use Embeds
Dramatic Failure: The demon causes an influx of Aether, amplifying all angelic and demonic powers well beyond the ability of their wielders to control them. Any expenditure of Aether or Essence sparks a coruscating wave of electricity that inflicts the Primum rating or Rank of the spender in lethal damage to everyone within five yards (including the character who spent the Aether/Essence). The demon also gains the Flagged Condition.
I'd assume it's supposed to last for "one scene," and that the Dramatic Failure case should have the same duration and radius of effect (on any targets within Primum x 4 yards) as the success case. But have the devs ever clarified officially anywhere?