Does this make any sense

今日、五時間ぐらい日本語を勉強しました。でも、明日は十時間仕事があります。

I am fairly confident my first sentence is right but I am not so sure about that second one, I want to say ‘but, I have work for ten hours tomorrow’

I think the first sentence is fine.
Hmmm maybe for the second you should use

でも、明日は10時間仕事をしなければなりません。

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Perfect thank you!

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