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All answers having "Long time" as clue:

3 Character Answers:

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AGE

AGO

EER

EON

ERA

SEE



4 Character Answers:

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AEON

AGES

ANOS

EONS

ITSA



5 Character Answers:

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AEONS

EPOCH

HOURS

NOSEE

YEARS

YONKS



7 Character Answers:

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CENTURY

DOGSAGE



8 Character Answers:

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BLUEMOON

COONSAGE

ETERNITY



9 Character Answers:

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MILLENIUM



14 Character Answers:

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FOREVERANDADAY

MONTHOFSUNDAYS



15 Character Answers:

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AMONTHOFSUNDAYS