This might not be the answer you’re looking for, but I write most of my pieces at night, a few hours before I go to bed, or sometimes even around half an hour before I go to bed. I find that I’m much more creative and inspired at night, after all the mundane tasks of school and work have been accomplished, and it’s also much easier for me to write at night.
So that’s why I’m able to turn out several pieces a day, because they’re all written in the evening or at night, when I’m most inspired.
Also, sometimes I write a piece and feel incredibly dissatisfied with it, so I end up deleting it and replacing it with another. So that might be another reason why you see so many pieces from me, when in reality I end up deleting some of them later.
I hope that all makes sense. :)