Decay keeps the map from filling up with permanently abandoned bases. Every structure tier has its own decay timer, and the clock only runs while a base is genuinely unvisited.

Structure TierDecay Timer
Thatch7.5 Days
Wood / Adobe15 Days
Stone22.5 Days
Greenhouse28 Days
Metal / Vault30 Days
Tek37.5 Days

Special Tek Structures

StructureDecay Timer
Tek Generator75 Days
Tek Transmitter75 Days
Tek Teleporter75 Days
Cryofridge (Ground-Placed)75 Days
Tek Trough150 Days
Connected Tek Dedicated Storage150 Days

Tamed Dinos

Approximately 30 days — the same timer also applies to Rafts and Meks.

What Players Need to Know