If you didn't say "exactly as long as it takes for 1 page" then keep reading.
The simple cms requires two items to create a web page: content and a template. The content is the text on the page, while the template tells the system how to transform that block of content into a finished page. The simple templating system allows your web designers focus on creating the design without worrying about the feasability of implementing that design across the site incrementally.
The typical template creation workflow is very similar to that of designing a new site.
Because template changes are so easy to implement in simple, they're also just as easy to roll back. So when your graphic designer comes up with a design that satisfies almost everybody, but the outcry from the vocal minority proves troublesome, you'll be able to implement the old template just as quickly as you implemented the new one.
Change the entry in the templates administration tab, click on "update all pages," and set your sights on mending your group's political fences.