What is the average total flight time to get a private pilot license in SF bayarea, CA?
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.