Much like the Poison Length Reduction mods, these are useful, but not really sought out. High cold resistance appears to lessen chill time as well. Cold spells can have very long chill times in hell difficulty, especially the Frost Nova when a Cold Enchanted monster dies, and your character is vulnerable when cold. These do not help against the Holy Freeze Aura Duriel and some other Aura Enchanted bosses have, nor against Paladins with it in PvP. These stack just like Unlike the Poison Length Reduction Reduced by modifiers. One cuts the time to 1/2, another to 1/4, then 1/8, etcHalf Freeze Length is applied only once; having more than one on your equipment is redundant.