Rawhide is a non-digestable product. If it takes your dog less than 4 hours to consume a rawhide treat PLEASE DON'T GIVE IT TO THE DOG. You are risking a choking or bloat problem. The 'knotted' rawhides (such as these) are especially dangerous in any size. With a small amount of chewing the bone can easily fit in the dogs mouth and many dogs will swallow the soggy mass and choke or, if the mass reaches the digestive tract it can become lodged and surgery is necessary to reduce the bloat.
The only rawhide bone my dog is allowed to have is a pressed rawhide that takes her at least 2 weeks of chewing to get half way done. As soon as the whole thing can potentially fit into her mouth, it is thrown away, much to her dipleasure. Mostly the beast gets Gumabones (Souper size) for her chewing pleasure, even though she is a 10" tall dog. Yep, the beast would definately be considered a super chewer.
On a final note, the dye they put in these rawhides WILL stain carpet. These bones just aren't worth the risk.