I’ve heard of someone who took over 60 units in a year (33 semester units one semester) and she got into Cal. That’s just a crazy example, so yes it is possible, but highly unlikely. I could never do that, and I’m sure about 99% of other CC students would agree.
It IS possible, however, to finish everything in a year if you have a large amount of AP units (from passed AP tests, with a score of 3 or higher). Then it’s possible, but still it’s incredibly difficult to finish all of your prerequisites for your major, fulfill your general education / IGETC, and transfer in a year. If you’re going to a CC, plan on staying there for two years. You need at least 60 units + prereq’s + general education fulfilled (it’s better to complete it than not) to transfer, it’s almost impossible to transfer in a year unless you have unusual circumstances and plan everything in advance, but I highly recommend not to attempt to do that.