Crossword puzzle clue "certain revolutions' durations"

Here are the possible solutions for certain revolutions' durations clue

Answer
Clue
Relevancy
years
Clue
Certain revolutions' durations
eons
Clue
Extra-long durations
Definition
EON, a long period of time, also AEON
lengths
Clue
Durations
Definition
LENGTH, the extent from end to end
lifespans
Clue
'Threescore and ten' durations
Definition
LIFESPAN, the time from birth to death
spans
Clue
Durations
terms
Clue
Durations
timeframes
Clue
Durations
Durations ... and what this puzzle's circles literally represent

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