How many words do you need to write in a day? I remember a teacher who seemed to say 1000.

Generally speaking, it is almost enough to stick to 800, at least 500, to ensure a certain amount, the beginning will be better.

1200 is fine if there are more and you are not tired.

The key is not how much you write, but how well you write every word, and it is most important to understand it carefully.