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I have read in this site about the Why "The 12-hour-system in English". Then my question is why "The 12-hour-system in English" rather than "The 12-hours-system in English"?

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Virtuous Legend
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    Please don't post pictures of text. Pictures can't be searched or indexed, they're unfriendly to people with vision problems or slow internet connections, and they don't add anything to the question. – stangdon Mar 20 '18 at 11:31

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There are 12 individual hours that make up the system, hence the 12 hour system. If I was saying there are 12 hours in a day, that's different because I'm talking about more than 1 hour. But this means the system consists of 12 individual hours.

Element115
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