It might take this long to save up for a superyacht! (3)
I believe the answer is:
eon
(Other definitions for eon that I've seen before include "Vast age; eternity" , "Vast period" , "Age, epoch" , "Long period of time" , "billion years" .)
I believe the answer is:
eon
(Other definitions for eon that I've seen before include "Vast age; eternity" , "Vast period" , "Age, epoch" , "Long period of time" , "billion years" .)