There's no way to tour all of the resorts in one morning unless you're just going to drive to each one and maybe take a picture of the sign and entrance. We've visited all the resorts, but it took several mornings (or afternoons) to walk around that many resorts to see the grounds, lobby, gift shops, etc. It was a lot of fun and well worth the time.
You could group the resorts (MK resorts, Epcot resorts, SSR & OKW for example) and that will help, but each group will probably take at least half a day (especially the MK and Epcot resorts).