office hours

noun
1.
the hours during which a professional person or an office conducts regular business.
2.
the hours a person spends working in an office.

Origin:
1795–1805

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
office hours
 
pl n
1.  the hours during which an office is open for business
2.  the number of hours worked in an office

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Dictionary.com's 21st Century Lexicon
Main Entry:  office hours1
Part of Speech:  n
Definition:  the normal hours a business is scheduled to be open
Main Entry:  office hours2
Part of Speech:  n
Definition:  the hours and days set by a professional for office consultations
Dictionary.com's 21st Century Lexicon
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Example sentences
If they're struggling with the material, their only option is to work it out in
  office hours.
They sit in every office hours, send lots of email and so forth.
He has the air of a respected first-year college teacher, giving you some of
  his time, and he lets you stay on after office hours.
And nearly half said some patients were being denied care because no
  appointments were available outside regular office hours.
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