I have to write a scientific report and I hate it

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I encountered one thing that I really hate about being a student of a University.
You basically write day and night on a scientific report to comply to a deadline.
If you achieved your goal you are happy but only for around 2 hours...
You get a reply from your professor, he says you have to rewrite everything.
And the next deadline is just 5 days away...
Basically my life in the last three weeks.