5040 minutes would be your answer. each day has 24 hours every hour is 60 minutes so multiply 60 times 24 and get 1440, then ou multiply it by 3 to get 4320 now since you ant half a day, divide 24 by 2 and get 12, now multiply 60 times 12 to get 720, now add 4320 and 720 to get, 5040
hope this helps