It's a pretty good first order approximation.
If you've written 400 daily poems and it doesn't seem to be having a positive effect, then it's certainly time to stop. If it's going well, then fair enough, you do you.
If you've written 400 daily poems and it doesn't seem to be having a positive effect, then it's certainly time to stop. If it's going well, then fair enough, you do you.
I'd probably say stop at around 7 if not positive, because then it is just a weird week long gimmick...