If you have time, you will usually learn it in 3-5 days, but the key is the taste, because in the snack business, only good taste can ensure the source of tourists, otherwise it will eventually fail to operate. I suggest you consult some professional training institutions, such as cooking school, where teachers are generally more powerful chefs and are more professional in cooking, ingredients and recipes. Moreover, this kind of cooking school is generally more formal, unlike some small organizations, which may pay money and eventually learn nothing. And in small organizations, sometimes in order to save costs, a teacher takes care of many students, and you may not learn well!