Not everyone only works on weekdays. I frequently do 6 or 7 day weeks, though thankfully the weekend shifts are usually relatively short. I have flex schedule, so when I have to help out my family during the week, I come in on the weekends to make up the time, and since I have young brothers I help care for, I often have to cut days during the week short, whether to pick up a brother from school or take them to a sport, etc.