Idk what your poetry book is about. It really depends on how you've themed it and what concept you're going for imo. If it's a very specific theme then I doubt you can write too many chapters. And if there are too many, it might take away from the excitement of the book, as things might get repetitive or smth.
For my current project, I'm not set on numbers. I'm planning to release as many as I can. But since it's a different concept than anything you lot are doing I can't have a say.
But for a normal poetry book I'll be releasing next, maybe a haikyuu, I'd go for smth like 40-60 chapters, perhaps.