Crossword puzzle clue "13 years of study"

Here are the possible solutions for 13 years of study clue

Answer
Clue
Relevancy
cram
Clue
Study, study, study
Definition
to pack tightly
nerds
Clue
"Study, study, study" types
Definition
NERD, a person obsessed with computers at the expense of human interaction, also NURD
ages
Clue
Years and years and years
Definition
AGE, to grow old
eon
Clue
Years and years and years
Definition
a long period of time, also AEON
eons
Clue
Years and years and years
Definition
EON, a long period of time, also AEON
elhi
Clue
13 years of study
Definition
(US) pertaining to school grades 1 to 12
phd
Clue
Result of many years of study, for short
aeons
Clue
Years and years
Definition
AEON, the largest division of geological time, composed of several eras, also EON

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