CSS Inserts - Is there a practical limit to how much code can go there?

Hi.

I'm installing Hackadelic's Table Of Contents Boxes plugin (http://hackadelic.com/solutions/wordpress/toc-boxes), and there is a decent "chunk" of CSS code that has to be installed in a CSS file or (my thought) in the CSS Inserts section.

It looks like it should work as an insert, but I'm wondering if there is a practical limit to how much can be added here.

Thanks in advance.