You always need to have completed 10 stays within the last 365 days, so this should be no problem over the course of the next year. If you get a second long stay guest, I would recommend you temporarily change your maximum length of stay to a week or so just to keep you in the safe zone. Just always be sure to maintain 10 visits in the last 365 days. If you get several short stays, you can change back.
It does seem weird, though. The company is discouraging long stays because of this requirement. I hope they are aware of this, and I have seen this issue come up before. You could post this problem to host voice (or better yet, find a posting already there and "like" it).