Go me!
I confess to feeling a little smug at the moment, having just written a 5000-word story in a little over four hours, including a couple of breaks, and immediately submitted it to its intended market. (Three guesses, and the first two don't count.)
I've been thinking about this story for weeks, though, and have had various aspects of it in mind for years, so it's not really fair to say that it only took four hours.
And, of course, who knows whether it's any good or not. We'll see.