As the saying goes, the master leads the door, and practice depends on the individual. The chefs in technical schools are mostly young people of seventeen or eighteen. As long as the goal is clear and you study hard, some will study in the kitchen school for one year and some will graduate in two years. Technical schools generally study theory and practice. After graduation, they can go to restaurants and hotels for internships and job applications.
Novice chefs are definitely not very good at it. It's up to them to practice and feel. As long as you can master knife, temperature, color and fragrance, you will succeed. To understand the characteristics of various cuisines, you may become a famous chef without education.
You can try if you don't believe me.