1-2 months. Vocational secondary school chef is usually divided into three stages, of which the first stage is "pre-school training", usually lasts 2-3 months, the second stage is "practical training", usually lasts 6-8 months, the third stage is "internship The third stage is "internship", which usually lasts 1-2 months. Vocational school chef's graduation time is roughly 9-12 months, you must pass the examination in order to obtain a vocational school to learn chef's diploma.