怎么说： I have classes all day long
the most important part here is "all day long"

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我一整天都有课。  “一整天”=All day long

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All day long in Chinese is“一整天”or "整天‘’. The translation of this sentence is “我一整天都有课”

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我  今天  一整天  都  上课。

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可以说“我要上一天的课”或者“我全天都有课”

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意思是“我一整天都有课”  "all day long"means“一整天”