I print one.
A little later I'll find out I'm not entirely happy with it, and print another one.
I have one negative I've been doing this to for 15 years - I must have used several boxes of paper in all sizes...
"Commercial Bank of ..." in the Critique gallery has been printed over a period of ten years. I now use a copy negative of it, since the original negative needs an inordinate amount of burning in.
but sometimes I print series of 25, and send them to the postcard list ;)