Closest thing out there seems to be: http://www.spaw.it/359/wordpress-plugin-limit-post-creation/, but it only sets a single, hard limit.
I think your best bet is to utilize this WordPress thread with code to limit number of posts for registered users: http://wordpress.org/support/topic/limit-the-number-of-posts-a-user-can-make?replies=18
You would need to change the $count_posts var to only count posts made within your time-frame…
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