It varies. It took me 5 years to complete my degree. And contrary to one of the other responses to the question, that was not because I was “slacking off”. I had two kids while I was an undergrad, and took one quarter off with each birth. read more
I presume you are asking about entering UCLA as a freshman. UCLA is a “4-year” school. anyone can finish in 4 years, but some slack off. MS is typically another 1.5–2 years, while a PhD used to avg 5.5 years, but some do it in 3 or less years (not easy). I spent 14 years all told for my 3 degrees. read more