Well, as someone who is currently keeping a dog calm for the next 7-10 days. The first few days are the easiest, they are still kind of sore and willing to believe you when you say, "really, you want take your 100th nap today." After that they pretty much look at you and go, "Nope, you can take another nap but I am ready to make my quota in destruction."
So my advice, if your dog likes Kongs, buy several and make a big batch of Kong stuffing.
Canned Pumpkin and dry kibble in equal parts, and then a couple of spoonfuls of canned food for flavor. Stuff the Kongs then freeze.
These tasty treats are lower cal than the same amount of plain dog food, and can take over an hour to empty fully. This is great for keeping a bored dog occupied and can be given for breakfast,lunch, and dinner and since it is lower cal the extra meal shouldn't be a problem.
Petedge has a good price on Kongs if you have to stock up, http://www.petedge.com