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On average, 170 working hours per month.
My assumptions are as follows: No vacation days and 10 federal holidays (2009) 52Wks/yr (365/7) 265 working days per year (52*5) 255 working days (265-10 federal holidays in 2009) 21.25 working days per month (255/12) 4.25 weeks per month (21.25/5) Therefore 21.25*8=170 as well as 4.25*40=170