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They are all equally hard depending on your personal style.
I find it hard to write short stories since all of my stories have multuple subplots and complex and wide ranging main plots. I think minimum for me is Novella or maybe Novllete length (15k-50k words).
Some people find short story the easiest format but to me it's hard to edit down my stories to that point and still accomplish what I want with them.
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