1
Ephemeral
~ms
Hover states, function returns, animation frames
2
Volatile
~min
In-memory atoms, working state, cleared on refresh
3
Session
~hrs
sessionStorage, tab-bound state, survives refresh
4
Local
~days
localStorage, IndexedDB, user-controlled
5
Distributed
~months
Git repos, CRDTs, P2P sync, server mesh
6
Archival
~years
IPFS, append-only logs, documentation
7
Geological
~eons
Mathematical axioms, protocol specifications