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According to Boddunan rules, minimum words requirement is 300 words. There is no maximum limit. But as articles are not supposed to be books and novels, length mist not be too big. Reasonable length would be 1000 words maximum. Bigger articles will not be readable and editors will need more time to edit. Moreover, very big articles may be rejected at editor/ administration discretion.
Every good article has a flow of informations. It automatically makes the size. You cannot willingly cut or elongate the piece. Make a target to give the best. It will automatically become the minimum length article, i.e. 350-400 words.