Many millennia (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">many millennia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for eons that I've seen before include "Endless periods" , "Times" , "Years and years" , "Divisions of archaeological time" , "Very long periods (US)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">many millennia</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for aeon that I've seen before include "Indefinitely long period of time" , "A very long time, an age" , "Eternity" , "An age; period" , "Vast age" .)