Since I'm doing FAWM (February Album-Writing Month) (for the first time), and I've just uploaded my first song, and it's Saturday, I'm going to subject you to it.
By the end of yesterday I'd squeezed out a four line verse and what looked like three lines of a chorus. The chorus actually made it all the way into the final song, having acquired two more lines. It took me a most of today to make the verses work, but when I got the last verse to come together I knew it was going to work.
The melody came together in less than an hour. That often happens; I tend to start hearing bits of it in my head while I'm writing. D is an easy key to play, and generally a good one for me to sing in.