It appears to have the same structural meaning as "24 hours a day, 7 days a week, 365 days a year", the second and third statements serve no actual purpose.
The only alternative I can think of is that they mean "5 minutes of each hour every day of the week, or an equivalent thereof" so that they could do 24 separate 5 minute broadcasts every day for seven days, or one continuous broadcast of 840 minutes in a seven day period, or any combination in between to add up to 840 minutes in seven day period.
Biting the hand that feeds IT
