Singular Eternity node for Delirium sometimes does nothing

With Singular Eternity, Delirium fog is supposed to dissipate 25% slower and last 10 additional seconds before dissipating. Sometimes you have to sprint through the map to keep the delirium going, and when it ends, the counter lasts 4 seconds and loot is immediate. When it works correctly, you can play in the fog for a decently long amount of time.

Every map I have to play detective and try to figure out if the fog will last a long time or if I'm going to have to sprint through the map and ignore other content.

Allocate Singular Eternity on Atlas tree. It's probably around 10% of the time that the delirium fog just moves really fast, and you have no chance to use it for most of the map.