Displaying text if you have X amount of post

[Mayers]

I want to keep some content hidden unless my member have say 50 posts. I know that the promotion system can do this by displaying to the group of users, but i'm having problems with scheduled tasks, so the promotion system is out of the question.

Also along with the above, I'd like to hide the content so a member has to post X amount of posts in 24 hours before the content can display.

How else would I go about doing this?