What sort of answer are you looking for? What people think should be the case, or what was the case in their own viva? I waited 7 weeks. My university has a policy on viva waits and normally they are to be held within 6 weeks of submission, and at most 3 months. There was a slight delay in my case while the internal examiner was swapped around, hence it going slightly over 6 weeks.
Hope you get a viva date soon. I'd hate to have to wait as long as you have. Doesn't your university have a policy on this sort of thing?