My son graduated a couple years ago. All his friends easily graduated in 4 years. He could have graduated a quarter or two early, but chose not to because he was having a great time. He had a little stumble freshman year and failed one class so was short on units, he had to go to a special counselor to ensure he got back on track. UCLA doesn’t want you to stay longer than 4 years because they need to make room for new students.