The SF Bay Area is more complex than some other airspaces. This does not mean that it will require more time, you just need to prepare for it.
I live on the SF peninsula and while I do not have a broad survey, I trained at the same time as two friends so I have three datapoints. I got my license with 41hrs training, one friend was under 50hrs and the other somewhere in the 60s. I doubt this is above the national average. This was some years ago, but the sky was already full. I guess now it is more full.
I picked my own instructor and did not let him teach me anything that I could learn from a book or on my own. We had every session topic planned ahead of time and I made sure I was well prepared. Far more important than where you train is your own attitude and diligence in preparation.