When it’s done, it’s done.

Done is not inking in the last letter in the 11th hour.

Done typically translates to a 3rd draft (ideally) submitted with time to spare.

Yes, this is NOT how we are accustomed to doing things in school/university.
That’s why the ‘real’ world is called what it is called I guess.

Because here, when you say it’s ‘done’, it better be just that – DONE.
PS: Build in ‘slack time’ into your plans