Wildly long time (3)
I believe the answer is:
eon
(Other definitions for eon that I've seen before include "An immense time" , "Vast age; eternity" , "Major division of geological time" , "Very long age" , "Geological period" .)
I believe the answer is:
eon
(Other definitions for eon that I've seen before include "An immense time" , "Vast age; eternity" , "Major division of geological time" , "Very long age" , "Geological period" .)