working day

noun2

1. •
   (UK) 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).

   • It will take five working days to process your application.
2. •
   (UK) The part of a day in which work is done; the number of hours one must work per day for a specified wage.

   • Your working day is 8 hours.