What We Know
When a Vessel breaks, the Spark remains active in the run. Current evidence supports recovering Glow by moving that Spark near a light source or a friendly player.
Steps or Conditions
Move toward visible light or regroup with a friendly player rather than remaining isolated in a hostile area. This page covers how to manage Glow once you are in Spark form; it does not replace the separate explanation of how a Vessel breaks.
What Does Not Work
Do not plan around an exact radius, a fixed timer, or a numeric recovery rate. Current evidence does not establish those values, and enemy pressure or darkness should not be reduced to an unverified formula.
Evidence and Limits
The official store explains the Spark state after a Vessel is lost, while a community-tested report describes recovery at lights and friendlies. Recheck this answer if a balance patch changes Glow behavior.