On that note, I got less than 7 weeks training and my manager was kicking me out on my own without even telling me I had a new schedule. I was promised 8, I am sure I could have if I really felt I needed it, but I just went with it I couldn't have made that much more of a difference. Ugh, management.
I think 8-12 weeks is average for orientation, but it also depends on the person. Some require a little longer and some are ready to fly on their own with less that 8 weeks. The most important thing is to communicate with your preceptor and gauge your readiness level. Don't be afraid to ask if you feel you need more time.