Hi Angie!
Aren't
Walt Disney World Special Offers great? I love to save a few dollars on my vacation... although, I don't really "save" them. I just end up with more souvenir money!
Typically, these types of discounts and promotions can only be used for the days specified. However, you may be able to save on a few days worth of lodging - so you should definitely call Disney and check. If the discount cannot be applied directly to your reservation, you can ask if you have the option to split your reservation into two: one which covers the non-discount nights and one for the discounted nights. Depending on the savings, it might be worth the extra effort to check out and check back into your resort! Or, you can always consider upgrading to a different resort for the last few nights. This "resort hopping", as it is called, is a great way to visit Disney resorts and try out different experiences!
Of course, if you're flexible, you could shift your dates slightly and take advantage of the discount for your full vacation. That will depend on your options for changing airfare, vacation from work, etc.
Hope you can get a good deal and save some Mickey Money!