business hours vs working day

business hours

noun
  • The hours and days when businesses generally operate; 8:00 AM to 5:00 PM, Monday to Friday. 

  • The hours and days when a given business is available to the public. 

working day

noun
  • Any of those days of a week on which work is done, officially Monday to Friday in many countries (even though many people work on weekends). 

  • The part of a day in which work is done; the number of hours one must work per day for a specified wage. 

How often have the words business hours and working day occurred in a corpus of books? (source: Google Ngram Viewer )