jbaker057,
This feature does not exist for discussions. The only place I have seen an enforceable word count is for essay questions in New Quizzes: How do I create an Essay question in New Quizzes?
About the only thing an instructor can do with discussions is convey the importance of having the proper length and then make it a factor in the grading so that students learn it is important.
The rest of this is an explanation of what it would take for your institution to do this since it is not available in Canvas. For more people, I recommend the technique in the previous paragraph of letting students know the importance. If you are using Canvas Free for Teachers, then communication with the students is your only real option.
Through JavaScript programming, it would be possible to monitor the word count and disable the reply button until a certain level was met. This would require the assistance of your local Canvas administrator as custom JavaScript can only be added at the institution level to an account or a sub-account. When this happens, it runs for everyone's courses within the account, not just yours. Unless you have a software development team at your institution, this may be beyond the level of the administrator to create. Administrators are often wary to install extra software because of warnings from Canvas that they are responsible for checking it and making sure it doesn't break with every release.
There would need to be some way to configure it as well. That means writing an interface on top of the Canvas interface or or allowing it to be specified within the post itself. As an instructor / administrator / programmer, I would take that second approach. You cannot leave comments within the HTML, but we have determined that some of the data attributes remain. Instructors would have to edit the HTML and add an element that would let the system know that it should enforce a word count and what the minimum word count was.
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