I'm onto 11 weeks of waiting now, I rang HMPO in Liverpool to track the progress and they said it hadn't been looked as of yet, so I think it's gonna be at least another 4 or 5 weeks.
I think there is a 7 day over time but even if it was more than 7 days you will just be fined (not sure how much but it's not big money) and it wouldn't effect you getting another Visa.