Very long time (4)
'very long time' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for donkeys years that I've seen before include "A long time (spent on Blackpool beach?)" , "What's evident in old ass" , "A beastly long time" , "An age" , "Yonks" .)
'very long time' is the definition.
(an extremely long period of time)
This is all the clue.
(Other definitions for eon that I've seen before include "Vast age; eternity" , "Vast age (alt. sp.)" , "In time, long division" , "Geological period" , "Major division of geological time" .)
'very long time' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for blue moon that I've seen before include "Once in one is a rare event" , "Indicator of rarity" , "Very rarely, if once in one of these" , "Very rare occurrence" , "Rodgers and Hart song" .)
'very long time' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for eons that I've seen before include "Very long periods (US)" , "Divisions of geological time" , "Years and years" , "Times" , "Long periods of time - noes have it" .)
'very long time' is the definition.
(ages can mean a very long period)
This is all the clue.
(Other definitions for ages that I've seen before include "Gets older" , "Times" , "Yonks" , "A long time (colloq.)" , "Rock of - - (hymn)" .)
'very long time' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for aeons that I've seen before include "Long periods of time" , "Vast ages" .)