[Steven Zahm]

@ Ramona

RE: How many characters does the excerpt size allow?

The default is 55. But you can change it per instance by using the excerpt_length=55 shortcode option for Excerpt Plus. Add it to the existing shortcode, change it to a value that makes sense for your use case.

RE: Can the CSS for this setting be specific to the page?

Some themes already have this as an option. If yours does, it will have a place for custom CSS when editing your page/post.

If you theme does not, there are plugins available which allow you to add custom CSS per page. I can not recommend any of the top of my head though.