It typically takes about 12 years to become a neurologist. 4 years are spent as an undergraduate working toward a bachelor's degree, and then another 4 years are spent in medical school.After medical school, graduates will then undertake a one year internship, followed by a 3 year residency program.t typically takes about 12 years to become a neurologist. 4 years are spent as an undergraduate working toward a bachelor's degree, and then another 4 years are spent in medical school.