Learn what "i've been working on them all day" means, when people say it, and how to use it naturally in English.

It means the person has spent all day doing work on something.
From I'M Obsessed With My Boss Part Ii, Episode 18
The speaker is saying they have spent the whole day working on something.
Use this to explain progress, effort, or why something is not finished yet. It is natural in work conversations and everyday talk.
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