You can drive on an international driving license for 6 months. The one week rule applies to driving licenses from other countries. For example, if you want to drive on a US or UK license, you can only drive for a week. However, the international driving license is good for 6 months. There is also the other option of getting a temporary Qatari license. Look in Marhaba for the regulations on that. I am not sure about other GCC licenses, but I think that they are good here.