What is thought shelf life?

Thought shelf life is a concept in personal epistemology: Not all thoughts decay at the same rate. A fleeting architectural insight has minutes before it degrades beyond recovery. A stable reference fact has weeks. Treating every thought with the same urgency — or the same patience — guarantees you lose the wrong ones.

Example: An engineering lead recognizes an architectural insight during morning standup — something about how the caching layer could eliminate three downstream race conditions. She's presenting, so she doesn't write it down. By afternoon, she remembers she had an insight about the caching layer. By the next morning, she remembers she had an insight. The specifics — the precise connection between the cache invalidation pattern and the race conditions — are gone. The thought had a shelf life of minutes. She gave it hours.

This concept is part of Phase 1 (Perception and Externalization) in the How to Think curriculum, which builds the epistemic infrastructure for perception and externalization.