How do I say "to make most of the day" in Chinese?
The complete sentence should be: "I got up 10 o'clock this morning, that's too late in my opinion. I prefer to get up early, so that I can make most out of the day.".

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make the most of the day- 充分利用这一天

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maybe i don't really get what you mean. 
 I prefer to get up early, so that I can make most out of the day 
Do you mean that you can do more things or you can get plenty of time to finish the things you suppose to do that day than that when you get up late? if so, we say 我喜欢早上早点起床，这样我可以做更多的事情。或这样我就可以轻松完成一天 的事情。

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‘充分利用每一天’i  think  should  be  better ,do you think  so ?

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Thank you, my mistake!

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You should say 'make the most of the day'.