The amount of hours in a nine day fortnight depends on how many hours you are contracted to work each week. If you work a 35 hour week, you must do 70 hours in a fortnight (35 x 2). To work out your nine day fortnight you just need to divide your hours over nine days, so that could be 7 days of 8 hours and 2 days of 7 hours. Or it could be 9 days of 7 hours 47 mins.