Well, Don, I had no idea, so I just sewed an inch and counted how many stitches. Eleven is what I use, apparently. That is when my machine is set to 2.5 (thought, to be honest, I don't know what type measurement that is...) That is the stitch length that my machine automatically starts with.
So...I suspect it is whatever feels best to you. But you knew that.
Dina