Stretches of time (4)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stretches of time</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eras that I've seen before include "typeface" , "Epochs" , "Periods, ages" , "Periods of time" , "Long and distinct periods of history" .)