User blog comment:Robot746/Wikis!/@comment-1785597-20120628033322/@comment-4316832-20120702024403

A such long block would cause users to lose interest, and not have much contributors. Also, spamming is common when users first start wikis. Give them a few chances, and give them a warning, and if they continue, block them for 1 week, then 1 year, then infinite; however, if they change, then somehow tell them that they improved.