How many years does it take to get a BA degree if..?

It should take around 4 total, but many programs are lately taking longer, even if you start at university... So don't be too surprised if that happens. The idea is to get the first two years, your general education requirements, out of the way at a community college, so you can transfer in as a junior and jump right into your major at university. The only issue is that credits don't always transfer how you want them to, so you'll want to do some research on the relationship between your specific schools first (i.e., call their admissions offices and ask about transfers between them). It helps if you get an associate's degree rather than just a mass of general credits in those first two years.

I personally got my AA at a community college in 2 years (plus one term at part-time), moved across the country, took classes part-time at another community college while I waited for residency, and transferred into university as a junior. It took 2.5 years to finish my BA, so the total was around 5 years. It would have been less if I'd transferred in with my lower-division foreign language requirements completed (24 credits, 6 classes), but I was foolish and didn't get that out of the way during my AA.

So yeah. I'd bank on 4-5 years total, which is pretty average, even starting at university. Good luck!

Simpson is correct. If everything is planned well, the entire bachelor's degree will take 4 years. All classes you would be taking your first 2 years at a university are offered at CC's. The reason some people take longer is that they may not be able to register for classes, due to them being full (but UC's have that problem nowadays too), or they don't plan well and take classes they don't need / that won't transfer. Make sure you follow IGETC and assist.org if you want to transfer.

Skip the community college route, go directly into the program you want. Community college is a waste of time and all your courses may not be transferred so it could take longer. It takes about 4 years.

If you go full time and plan correctly, community college should be your first two years. You would then do your final two years at a university for four years total.