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All answers having "Days ___" as clue:

3 Character Answers:

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AGO

DOG

INN



4 Character Answers:

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ERAS

INNS

SUNS



5 Character Answers:

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EMBER

HAPPY

OLDEN

ONEND

PALMY

RADIO

SALAD

THESE



6 Character Answers:

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OFYORE



7 Character Answers:

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INTHESE



15 Character Answers:

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LARAINEANDDORIS



21 Character Answers:

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THREEHUNDREDSIXTYFIVE