Vulcan607,
As tallguyina152 said, if you've got 7 days and 35 hours to play with ..... look further afield than northern France. I don't know what you'll be flying, but two trips I've done in the past three years that came in at around 25 hours were Maastricht - Gdansk-Talinn-Krakow-Budapest-Prague-Maastricht and Maastricht-Freidrichshaven-Dubrovnik-Florence-La Rochelle-Maastricht.
The continent is your oyster, my friend.