Totally possible to only take 2 years at CC. I know several students who graduated from UCs and the whole process - community college to UC graduation - only took 4 years. One young woman even graduated in 3 1/2 years. Be willing to take classes at less-than-popular times, like 8 am.
At our local California CC, the counseling office/ transfer center is fantastic. If you are in CA, contact the transfer center your local CC. They can help you with all of your questions, and help you draft a plan to transfer to UCs.