Crossword puzzle clue "time worth studying"

Here are the possible solutions for time worth studying clue

Answer
Clue
Relevancy
era
Clue
Time worth studying
Definition
a main division of geological time
cram
Clue
Do a term's worth of studying in one night
Do a semester's worth of studying in one night, say
Make up for lost studying time
Definition
to pack tightly
psec
Clue
Time unit for studying the speed of light: Abbr.
recess
Clue
School time when kids aren't studying
Definition
to place in a hollow
ifa
Clue
"___ job's worth doing, it's worth doing well": 2 wds.
aced
Clue
Justified serious studying for
Definition
ACE, to serve an unreturnable shot e.g. in tennis

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