The types are different, the complexity is not the same, the time is not the same.

This is one thing.

The other and the training of the teacher's teaching ability also has a relationship, if it is all standardized recipe process, learn faster.

Because learning is a process, ingredients, the use of machinery and equipment.

The ingredients are standardized, when to add what ingredients. So simply learning the process machine use is quick.

If you want to work in this industry, you can add attention or private message.