Originally, the phrase was not a slashed numerical, but overtly stated. When you declare things overtly, the flow of categories matters much less.

"Twenty four hours a day, seven days a week, three hundred and sixty five days a year!", when clearly stated, the middle segment, not the final one, is the one in error, as it is superfluous. The final segment is fine, but it reconfirms the prior statement, making the prior statement unnecessary.