Ray Bradbury says:

“If you can write one short story a week, it doesn’t matter what the quality is to start—at least you’re practicing. At the end of the year you have 52 short stories. And I defy you to write 52 bad ones. It can’t be done. After 30 or 40 weeks, all of a sudden a story will come that is wonderful — just wonderful. That’s what happened to me.”