That's a good idea, DMcG.

I still remember how much I resented a woman in Milwaukee who was large in size, dressed expensively, had a loud, trained voice and who took over a session by singing songs 36 verses long.

I don't mean she was fat. She was tall and strong, and dominating people had just become a habit with her. I've seen behavior like that elsewhere, and now I don't accept it. All 5'3" of me springs into action.
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I don't think anybody has mentioned the tune of a long song. If a long song has a tune only 8 measures long, it's a good idea to compose a Part B of your own. Heck, maybe even a Part C. You have just as much right to compose a ballad tune as anybody else.

And there's nothing that says you can't add an artful chorus for the audience to sing. It can be short.