52 weeks in a year less 2 weeks vacation = 50 weeks worked. You work 2 days per week. (Saturday & Sunday) 50 weeks x 2 days per week x 8 hours per day = 800 hours. So, to check an answer, I like to write an equation creating variables from the question. If you write this out as an equation, all variables cross out but hours. 50week x 2days/week = 100 days (week is crossed out). Then 100 days x 8 hours/day = 800 hours (days cross out), When you write questions out as an equation like above, it may make more sense.