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Class is from 6 to 8 pm.

授業は午後六時から午後八時までです

授業は午後六時から八時までです

How should this be expressed ?
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2020-06-09T04:38:02.593
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question
grammar words
Should I say 午後 once, twice or something else?
Saying 午後 twice is not wrong at all, but 授業は午後6時から8時までです is enough.

If you want to say the class lasts until the next morning, you can add 午前, 朝
or 翌【よく】 (="on the next day"). e.g., "授業は午後6時から翌8時までです"
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2020-06-09T05:01:30.047
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To further avoid confusion, you can just use 24H time. It is quite common in
Japan.

>   * 授業は18時から20時までです
>

I've also seen izakaya/karaoke places/other nighttime entertainment
establishments that go _past_ 24 to indicate how late they are open.

> (居酒屋) 閉店：26時
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