20 minutes for the Small Asteroid Cluster
1 hour for the Medium Asteroid Cluster
2 hours for the Large Asteroid Cluster variants
4 hours for the Enormous Asteroid Cluster variants
5 hours for the Colossal Asteroid Cluster variants

Hardeners Required for NPCs
Angel - All
Amarr Navy - EM/Thermal
Blood - EM/Thermal
Caldary Navy - Kinetic/Thermal
Gurista - Kinetic/Thermal
Mordus - Kinetic/Thermal
Gallente - Kinetic/Thermal
Khanid - EM/Thermal
Mercenary - EM/Thermal/Kinetic
Mordus - Kinetic/thermal
Rogue Pirate - EM/Explosive/Kinetic
Sansha - EM/Thermal
Serpentis - Kinetic/Thermal
Thukker - Kinetic/Thermal/Explosive
Odamian - Kinetic/Thermal