My sister used to work a 9/9 shift in biotech (9 9 hour shifts, every other Friday off). It meant she had plenty of time for all-day experiments and could have

My sister used to work a 9/9 shift in biotech (9 9 hour shifts, every other Friday off). It meant she had plenty of time for all-day experiments and could have a day for errands and shopping during normal business hours.